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An encyclopedia (
American English American English, sometimes called United States English or U.S. English, is the set of variety (linguistics), varieties of the English language native to the United States. English is the Languages of the United States, most widely spoken lan ...
) or encyclopædia (
British English British English (BrE, en-GB, or BE) is, according to Lexico, Oxford Dictionaries, "English language, English as used in Great Britain, as distinct from that used elsewhere". More narrowly, it can refer specifically to the English language in ...
) is a
reference work A reference work is a work, such as a paper, book or periodical (or their electronic equivalents), to which one can refer for information. The information is intended to be found quickly when needed. Such works are usually ''referred'' to f ...
or
compendium A compendium (plural: compendia or compendiums) is a comprehensive collection of information and analysis pertaining to a body of knowledge. A compendium may concisely summarize a larger work. In most cases, the body of knowledge will concern a s ...
providing summaries of
knowledge Knowledge can be defined as awareness of facts or as practical skills, and may also refer to familiarity with objects or situations. Knowledge of facts, also called propositional knowledge, is often defined as true belief that is distinc ...
either general or special to a particular field or discipline. Encyclopedias are divided into
articles Article often refers to: * Article (grammar), a grammatical element used to indicate definiteness or indefiniteness * Article (publishing), a piece of nonfictional prose that is an independent part of a publication Article may also refer to: G ...
or entries that are arranged
alphabetically Alphabetical order is a system whereby character strings are placed in order based on the position of the characters in the conventional ordering of an alphabet. It is one of the methods of collation. In mathematics, a lexicographical order is t ...
by article name or by thematic categories, or else are
hyperlinked ''Hyperlinked'' is an American semi-autobiography streaming television series produced exclusively for YouTube Premium, featuring the now-disbanded music group L2M. The series was created by Juliette Brindak Blake, Hermine Brindak and Larry Re ...
and searchable. Encyclopedia entries are longer and more detailed than those in most
dictionaries A dictionary is a listing of lexemes from the lexicon of one or more specific languages, often arranged alphabetically (or by radical and stroke for ideographic languages), which may include information on definitions, usage, etymologies, p ...
. Generally speaking, encyclopedia articles focus on '' factual information'' concerning the subject named in the article's title; this is unlike dictionary entries, which focus on
linguistic Linguistics is the scientific study of human language. It is called a scientific study because it entails a comprehensive, systematic, objective, and precise analysis of all aspects of language, particularly its nature and structure. Linguis ...
information about
word A word is a basic element of language that carries an semantics, objective or pragmatics, practical semantics, meaning, can be used on its own, and is uninterruptible. Despite the fact that language speakers often have an intuitive grasp of w ...
s, such as their
etymology Etymology ()The New Oxford Dictionary of English (1998) – p. 633 "Etymology /ˌɛtɪˈmɒlədʒi/ the study of the class in words and the way their meanings have changed throughout time". is the study of the history of the Phonological chan ...
, meaning,
pronunciation Pronunciation is the way in which a word or a language is spoken. This may refer to generally agreed-upon sequences of sounds used in speaking a given word or language in a specific dialect ("correct pronunciation") or simply the way a particular ...
, use, and
grammatical In linguistics, grammaticality is determined by the conformity to language usage as derived by the grammar of a particular variety (linguistics), speech variety. The notion of grammaticality rose alongside the theory of generative grammar, the go ...
forms.Béjoint, Henri (2000)
''Modern Lexicography''
, pp. 30–31. Oxford University Press.
Encyclopedias have existed for around 2,000 years and have evolved considerably during that time as regards language (written in a major international or a vernacular language), size (few or many volumes), intent (presentation of a global or a limited range of knowledge), cultural perspective (authoritative, ideological, didactic, utilitarian), authorship (qualifications, style), readership (education level, background, interests, capabilities), and the technologies available for their production and distribution (hand-written manuscripts, small or large print runs, Internet). As a valued source of reliable information compiled by experts, printed versions found a prominent place in libraries, schools and other educational institutions. The appearance of digital and open-source versions in the 21st century, such as
Wikipedia Wikipedia is a multilingual free online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and using a wiki-based editing system. Wikipedia is the largest and most-read refer ...
, has vastly expanded the accessibility, authorship, readership, and variety of encyclopedia entries.


Etymology

The word ''
encyclopedia An encyclopedia (American English) or encyclopædia (British English) is a reference work or compendium providing summaries of knowledge either general or special to a particular field or discipline. Encyclopedias are divided into articles ...
'' (''encyclo'', ''pedia'') comes from the
Koine Greek Koine Greek (; Koine el, ἡ κοινὴ διάλεκτος, hē koinè diálektos, the common dialect; ), also known as Hellenistic Greek, common Attic, the Alexandrian dialect, Biblical Greek or New Testament Greek, was the common supra-reg ...
,
transliterated Transliteration is a type of conversion of a text from one script to another that involves swapping letters (thus '' trans-'' + '' liter-'') in predictable ways, such as Greek → , Cyrillic → , Greek → the digraph , Armenian → or ...
, meaning 'general education' from (), meaning 'circular, recurrent, required regularly, general' and (), meaning 'education, rearing of a child'; together, the phrase literally translates as 'complete instruction' or 'complete knowledge'. However, the two separate words were reduced to a single word due to a scribal error by copyists of a
Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...
manuscript edition of
Quintillian Marcus Fabius Quintilianus (; 35 – 100 AD) was a Roman educator and rhetorician from Hispania, widely referred to in medieval schools of rhetoric and in Renaissance writing. In English translation, he is usually referred to as Quintilian ...
in 1470. The copyists took this phrase to be a single Greek word, ''enkyklopaedia'', with the same meaning, and this spurious Greek word became the
New Latin New Latin (also called Neo-Latin or Modern Latin) is the revival of Literary Latin used in original, scholarly, and scientific works since about 1500. Modern scholarly and technical nomenclature, such as in zoological and botanical taxonomy ...
word ''encyclopaedia'', which in turn came into English. Because of this compounded word, fifteenth-century readers and since have often, and incorrectly, thought that the Roman authors
Quintillian Marcus Fabius Quintilianus (; 35 – 100 AD) was a Roman educator and rhetorician from Hispania, widely referred to in medieval schools of rhetoric and in Renaissance writing. In English translation, he is usually referred to as Quintilian ...
and
Pliny Pliny may refer to: People * Pliny the Elder (23–79 CE), ancient Roman nobleman, scientist, historian, and author of ''Naturalis Historia'' (''Pliny's Natural History'') * Pliny the Younger (died 113), ancient Roman statesman, orator, w ...
described an ancient genre.


Characteristics

The modern encyclopedia was developed from the
dictionary A dictionary is a listing of lexemes from the lexicon of one or more specific languages, often arranged alphabetically (or by radical and stroke for ideographic languages), which may include information on definitions, usage, etymologies ...
in the 18th century. Historically, both encyclopedias and dictionaries have been researched and written by well-educated, well-informed content
expert An expert is somebody who has a broad and deep understanding and competence in terms of knowledge, skill and experience through practice and education in a particular field. Informally, an expert is someone widely recognized as a reliable s ...
s, but they are significantly different in structure. A dictionary is a linguistic work which primarily focuses on alphabetical listing of
words A word is a basic element of language that carries an objective or practical meaning, can be used on its own, and is uninterruptible. Despite the fact that language speakers often have an intuitive grasp of what a word is, there is no consen ...
and their
definitions A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols). Definitions can be classified into two large categories: intensional definitions (which try to give the sense of a term), and extensional definiti ...
.
Synonym A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are all ...
ous words and those related by the subject matter are to be found scattered around the dictionary, giving no obvious place for in-depth treatment. Thus, a dictionary typically provides limited
information Information is an abstract concept that refers to that which has the power to inform. At the most fundamental level information pertains to the interpretation of that which may be sensed. Any natural process that is not completely random ...
,
analysis Analysis ( : analyses) is the process of breaking a complex topic or substance into smaller parts in order to gain a better understanding of it. The technique has been applied in the study of mathematics and logic since before Aristotle (38 ...
or background for the word defined. While it may offer a definition, it may leave the reader lacking in
understanding Understanding is a psychological process related to an abstract or physical object, such as a person, situation, or message whereby one is able to use concepts to model that object. Understanding is a relation between the knower and an object o ...
the meaning, significance or limitations of a
term Term may refer to: * Terminology, or term, a noun or compound word used in a specific context, in particular: **Technical term, part of the specialized vocabulary of a particular field, specifically: ***Scientific terminology, terms used by scient ...
, and how the term relates to a broader field of knowledge. To address those needs, an encyclopedia article is typically not limited to simple definitions, and is not limited to defining an individual word, but provides a more extensive meaning for a ''subject or
discipline Discipline refers to rule following behavior, to regulate, order, control and authority. It may also refer to punishment. Discipline is used to create habits, routines, and automatic mechanisms such as blind obedience. It may be inflicted on ot ...
''. In addition to defining and listing synonymous terms for the topic, the article is able to treat the topic's more extensive meaning in more depth and convey the most relevant accumulated knowledge on that subject. An encyclopedia article also often includes many
map A map is a symbolic depiction emphasizing relationships between elements of some space, such as objects, regions, or themes. Many maps are static, fixed to paper or some other durable medium, while others are dynamic or interactive. Although ...
s and
illustration An illustration is a decoration, interpretation or visual explanation of a text, concept or process, designed for integration in print and digital published media, such as posters, flyers, magazines, books, teaching materials, animations, vid ...
s, as well as
bibliography Bibliography (from and ), as a discipline, is traditionally the academic study of books as physical, cultural objects; in this sense, it is also known as bibliology (from ). English author and bibliographer John Carter describes ''bibliography ...
and
statistics Statistics (from German language, German: ''wikt:Statistik#German, Statistik'', "description of a State (polity), state, a country") is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of ...
. An encyclopedia is, theoretically, not written in order to convince, although one of its goals is indeed to convince its reader of its own veracity.


Four major elements

There are four major elements that define an encyclopedia: its subject matter, its scope, its method of organization, and its method of production: # Encyclopedias can be general, containing articles on topics in every field (the English-language ''
Encyclopædia Britannica The (Latin for "British Encyclopædia") is a general knowledge English-language encyclopaedia. It is published by Encyclopædia Britannica, Inc.; the company has existed since the 18th century, although it has changed ownership various time ...
'' and German '' Brockhaus'' are well-known examples). General encyclopedias may contain guides on how to do a variety of things, as well as embedded dictionaries and
gazetteer A gazetteer is a geographical index or directory used in conjunction with a map or atlas.Aurousseau, 61. It typically contains information concerning the geographical makeup, social statistics and physical features of a country, region, or con ...
s. There are also encyclopedias that cover a wide variety of topics from a particular cultural, ethnic, or national perspective, such as the ''
Great Soviet Encyclopedia The ''Great Soviet Encyclopedia'' (GSE; ) is one of the largest Russian-language encyclopedias, published in the Soviet Union from 1926 to 1990. After 2002, the encyclopedia's data was partially included into the later ''Bolshaya rossiyskaya e ...
'' or ''
Encyclopaedia Judaica The ''Encyclopaedia Judaica'' is a 22-volume English-language encyclopedia of the Jewish people, Judaism, and Israel. It covers diverse areas of the Jewish world and civilization, including Jewish history of all eras, culture, holidays, langu ...
''. # Works of encyclopedic scope aim to convey the important accumulated knowledge for their subject domain, such as an encyclopedia of
medicine Medicine is the science and practice of caring for a patient, managing the diagnosis, prognosis, prevention, treatment, palliation of their injury or disease, and promoting their health. Medicine encompasses a variety of health care pract ...
,
philosophy Philosophy (from , ) is the systematized study of general and fundamental questions, such as those about existence, reason, knowledge, values, mind, and language. Such questions are often posed as problems to be studied or resolved. Some ...
or
law Law is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior,Robertson, ''Crimes against humanity'', 90. with its precise definition a matter of longstanding debate. It has been vario ...
. Works vary in the breadth of material and the depth of discussion, depending on the
target audience A target audience is the intended audience or readership of a publication, advertisement, or other message catered specifically to said intended audience. In marketing and advertising, it is a particular group of consumer within the predetermined ...
. # Some systematic method of organization is essential to making an encyclopedia usable for reference. There have historically been two main methods of organizing printed encyclopedias: the
alphabetical Alphabetical order is a system whereby character strings are placed in order based on the position of the characters in the conventional ordering of an alphabet. It is one of the methods of collation. In mathematics, a lexicographical order is t ...
method (consisting of a number of separate articles, organized in alphabetical order) and organization by
hierarchical A hierarchy (from Greek: , from , 'president of sacred rites') is an arrangement of items (objects, names, values, categories, etc.) that are represented as being "above", "below", or "at the same level as" one another. Hierarchy is an important ...
categories. The former method is today the more common, especially for general works. The fluidity of
electronic media Electronic media are media that use electronics or electromechanical means for the audience to access the content. This is in contrast to static media (mainly print media), which today are most often created digitally, but do not require el ...
, however, allows new possibilities for multiple methods of organization of the same content. Further, electronic media offer new capabilities for search, indexing and
cross reference The term cross-reference (abbreviation: xref) can refer to either: * An instance within a document which refers to related information elsewhere in the same document. In both printed and online dictionaries cross-references are important because ...
. The epigraph from
Horace Quintus Horatius Flaccus (; 8 December 65 – 27 November 8 BC), known in the English-speaking world as Horace (), was the leading Roman lyric poet during the time of Augustus (also known as Octavian). The rhetorician Quintilian regarded his ' ...
on the title page of the 18th century ''Encyclopédie'' suggests the importance of the structure of an encyclopedia: "What grace may be added to commonplace matters by the power of order and connection." # As modern multimedia and the information age have evolved, new methods have emerged for the collection, verification, summation, and presentation of information of all kinds. Projects such as
Everything2 Everything2 (styled Everything2 or E2 for short) is a collaborative Web-based community consisting of a database of interlinked user-submitted written material. E2 is moderated for quality, but has no formal policy on subject matter. Writing on ...
,
Encarta ''Microsoft Encarta'' is a discontinued digital multimedia encyclopedia published by Microsoft from 1993 to 2009. Originally sold on CD-ROM or DVD, it was also available on the World Wide Web via an annual subscription, although later articles ...
,
h2g2 The h2g2 website is a British-based collaborative online encyclopedia project. It describes itself as "an unconventional guide to life, the universe, and everything", in the spirit of the fictional publication '' The Hitchhiker's Guide to ...
, and
Wikipedia Wikipedia is a multilingual free online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and using a wiki-based editing system. Wikipedia is the largest and most-read refer ...
are examples of new forms of the encyclopedia as
information retrieval Information retrieval (IR) in computing and information science is the process of obtaining information system resources that are relevant to an information need from a collection of those resources. Searches can be based on full-text or other co ...
becomes simpler. The method of production for an encyclopedia historically has been supported in both for-profit and non-profit contexts. The ''
Great Soviet Encyclopedia The ''Great Soviet Encyclopedia'' (GSE; ) is one of the largest Russian-language encyclopedias, published in the Soviet Union from 1926 to 1990. After 2002, the encyclopedia's data was partially included into the later ''Bolshaya rossiyskaya e ...
'' mentioned above was entirely state sponsored, while the ''Britannica'' was supported as a for-profit institution. By comparison, Wikipedia is supported by volunteers contributing in a non-profit environment under the organization of the
Wikimedia Foundation The Wikimedia Foundation, Inc., or Wikimedia for short and abbreviated as WMF, is an American 501(c)(3) nonprofit organization headquartered in San Francisco, California and registered as a charitable foundation under local laws. Best kno ...
.


Encyclopedic dictionaries

Some works entitled "dictionaries" are actually similar to encyclopedias, especially those concerned with a particular field (such as the ''
Dictionary of the Middle Ages The ''Dictionary of the Middle Ages'' is a 13-volume encyclopedia of the Middle Ages published by the American Council of Learned Societies between 1982 and 1989. It was first conceived and started in 1975 with American medieval historian Jo ...
'', the ''
Dictionary of American Naval Fighting Ships The ''Dictionary of American Naval Fighting Ships'' (''DANFS'') is the official reference work for the basic facts about ships used by the United States Navy. When the writing project was developed the parameters for this series were designed to ...
'', and '' Black's Law Dictionary''). The ''
Macquarie Dictionary The ''Macquarie Dictionary'' () is a dictionary of Australian English. It is generally considered by universities and the legal profession to be the authoritative source on Australian English. It also pays considerable attention to New Zealand ...
,'' Australia's national dictionary, became an encyclopedic dictionary after its first edition in recognition of the use of proper nouns in common communication, and the words derived from such proper nouns.


Differences between encyclopedias and dictionaries

There are some broad differences between encyclopedias and dictionaries. Most noticeably, encyclopedia articles are longer, fuller and more thorough than entries in most general-purpose dictionaries. There are differences in content as well. Generally speaking, dictionaries provide
linguistic Linguistics is the scientific study of human language. It is called a scientific study because it entails a comprehensive, systematic, objective, and precise analysis of all aspects of language, particularly its nature and structure. Linguis ...
information about words themselves, while encyclopedias focus more on the thing for which those words stand. Thus, while dictionary entries are inextricably fixed to the word described, encyclopedia articles can be given a different entry name. As such, dictionary entries are not fully translatable into other languages, but encyclopedia articles can be. In practice, however, the distinction is not concrete, as there is no clear-cut difference between factual, "encyclopedic" information and linguistic information such as appears in dictionaries. Thus encyclopedias may contain material that is also found in dictionaries, and vice versa. In particular, dictionary entries often contain factual information about the thing named by the word.


History

Encyclopedias have progressed from the beginning of history in written form, through medieval and modern times in print, and most recently, displayed on computer and distributed via computer networks, including the Internet.


Written encyclopedias

The earliest encyclopedic work to have survived to modern times is the ''
Naturalis Historia The ''Natural History'' ( la, Naturalis historia) is a work by Pliny the Elder. The largest single work to have survived from the Roman Empire to the modern day, the ''Natural History'' compiles information gleaned from other ancient authors. ...
'' of
Pliny the Elder Gaius Plinius Secundus (AD 23/2479), called Pliny the Elder (), was a Roman author, naturalist and natural philosopher, and naval and army commander of the early Roman Empire, and a friend of the emperor Vespasian. He wrote the encyclopedic '' ...
, a
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *''Epistle to the Romans'', shortened to ''Romans'', a letter ...
statesman living in the 1st century AD. He compiled a work of 37 chapters covering natural history, architecture, medicine,
geography Geography (from Greek: , ''geographia''. Combination of Greek words ‘Geo’ (The Earth) and ‘Graphien’ (to describe), literally "earth description") is a field of science devoted to the study of the lands, features, inhabitants, and ...
, geology, and all aspects of the world around him. This work became very popular in Antiquity, was one of the first classical manuscripts to be printed in 1470, and has remained popular ever since as a source of information on the
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *''Epistle to the Romans'', shortened to ''Romans'', a letter ...
world, and especially
Roman art The art of Ancient Rome, and the territories of its Republic and later Empire, includes architecture, painting, sculpture and mosaic work. Luxury objects in metal-work, gem engraving, ivory carvings, and glass are sometimes considered to be mi ...
,
Roman technology Roman technology is the collection of antiques, skills, methods, processes, and engineering practices which supported Roman civilization and made possible the expansion of the economy and military of ancient Rome (753 BC – 476 AD). The Roma ...
and Roman engineering. The Spanish scholar
Isidore of Seville Isidore of Seville ( la, Isidorus Hispalensis; c. 560 – 4 April 636) was a Spanish scholar, theologian, and archbishop of Seville. He is widely regarded, in the words of 19th-century historian Montalembert, as "the last scholar of ...
was the first Christian writer to try to compile a '' summa'' of universal knowledge, the ''
Etymologiae ''Etymologiae'' (Latin for "The Etymologies"), also known as the ''Origines'' ("Origins") and usually abbreviated ''Orig.'', is an etymological encyclopedia compiled by Isidore of Seville (c. 560–636) towards the end of his life. Isidore was ...
'' (c. 600–625), also known by classicists as the ''Origines'' (abbreviated ''Orig''.). This encyclopedia—the first such Christian
epitome An epitome (; gr, ἐπιτομή, from ἐπιτέμνειν ''epitemnein'' meaning "to cut short") is a summary or miniature form, or an instance that represents a larger reality, also used as a synonym for embodiment. Epitomacy represents "t ...
—formed a huge compilation of 448 chapters in 20 volumesMacFarlane 1980:4; MacFarlane translates ''Etymologiae'' viii. based on hundreds of classical sources, including ''Natural Historia''. Of Etymologiae in its time it was said ''quaecunque fere sciri debentur'', "practically everything that it is necessary to know". Among the areas covered were:
grammar In linguistics, the grammar of a natural language is its set of structure, structural constraints on speakers' or writers' composition of clause (linguistics), clauses, phrases, and words. The term can also refer to the study of such constraint ...
,
rhetoric Rhetoric () is the art of persuasion, which along with grammar and logic (or dialectic), is one of the three ancient arts of discourse. Rhetoric aims to study the techniques writers or speakers utilize to inform, persuade, or motivate parti ...
,
mathematics Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics ...
,
geometry Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is c ...
,
music Music is generally defined as the art of arranging sound to create some combination of form, harmony, melody, rhythm or otherwise expressive content. Exact definitions of music vary considerably around the world, though it is an aspect ...
,
astronomy Astronomy () is a natural science that studies astronomical object, celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and chronology of the Universe, evolution. Objects of interest ...
,
medicine Medicine is the science and practice of caring for a patient, managing the diagnosis, prognosis, prevention, treatment, palliation of their injury or disease, and promoting their health. Medicine encompasses a variety of health care pract ...
,
law Law is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior,Robertson, ''Crimes against humanity'', 90. with its precise definition a matter of longstanding debate. It has been vario ...
, the
Catholic Church The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...
and
heretical Heresy is any belief or theory that is strongly at variance with established beliefs or customs, in particular the accepted beliefs of a church or religious organization. The term is usually used in reference to violations of important religi ...
sects,
pagan Paganism (from classical Latin ''pāgānus'' "rural", "rustic", later "civilian") is a term first used in the fourth century by early Christians for people in the Roman Empire who practiced polytheism, or ethnic religions other than Judaism. ...
philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek th ...
s,
language Language is a structured system of communication. The structure of a language is its grammar and the free components are its vocabulary. Languages are the primary means by which humans communicate, and may be conveyed through a variety of met ...
s,
cities A city is a human settlement of notable size.Goodall, B. (1987) ''The Penguin Dictionary of Human Geography''. London: Penguin.Kuper, A. and Kuper, J., eds (1996) ''The Social Science Encyclopedia''. 2nd edition. London: Routledge. It can be def ...
,
animal Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motilit ...
s and
bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...
s, the
physical world The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. The Big Bang theory is the prevailing cosmological description of the development of the universe. Acco ...
,
geography Geography (from Greek: , ''geographia''. Combination of Greek words ‘Geo’ (The Earth) and ‘Graphien’ (to describe), literally "earth description") is a field of science devoted to the study of the lands, features, inhabitants, and ...
,
public buildings A building, or edifice, is an enclosed structure with a roof and walls standing more or less permanently in one place, such as a house or factory (although there's also portable buildings). Buildings come in a variety of sizes, shapes, and fu ...
,
road A road is a linear way for the conveyance of traffic that mostly has an improved surface for use by vehicles (motorized and non-motorized) and pedestrians. Unlike streets, the main function of roads is transportation. There are many types of ...
s,
metals A metal (from Greek μέταλλον ''métallon'', "mine, quarry, metal") is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typicall ...
,
rock Rock most often refers to: * Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids * Rock music, a genre of popular music Rock or Rocks may also refer to: Places United Kingdom * Rock, Caerphilly, a location in Wales ...
s,
agriculture Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to ...
,
ship A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying cargo or passengers, or in support of specialized missions, such as defense, research, and fishing. Ships are generally distinguished ...
s,
clothes Clothing (also known as clothes, apparel, and attire) are items worn on the human body, body. Typically, clothing is made of fabrics or textiles, but over time it has included garments made from animal skin and other thin sheets of materials ...
,
food Food is any substance consumed by an organism for nutritional support. Food is usually of plant, animal, or fungal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is inge ...
, and
tool A tool is an object that can extend an individual's ability to modify features of the surrounding environment or help them accomplish a particular task. Although many animals use simple tools, only human beings, whose use of stone tools dates ba ...
s. Another Christian encyclopedia was the ''Institutiones divinarum et saecularium litterarum'' of
Cassiodorus Magnus Aurelius Cassiodorus Senator (c. 485 – c. 585), commonly known as Cassiodorus (), was a Roman statesman, renowned scholar of antiquity, and writer serving in the administration of Theodoric the Great, king of the Ostrogoths. ''Senator'' w ...
(543-560) dedicated to the Christian Divinity and to the seven liberal arts. The encyclopedia of
Suda The ''Suda'' or ''Souda'' (; grc-x-medieval, Σοῦδα, Soûda; la, Suidae Lexicon) is a large 10th-century Byzantine encyclopedia of the ancient Mediterranean world, formerly attributed to an author called Soudas (Σούδας) or Souidas ...
, a massive 10th-century Byzantine encyclopedia, had 30,000 entries, many drawing from ancient sources that have since been lost, and often derived from medieval
Christian Christians () are people who follow or adhere to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. The words ''Christ'' and ''Christian'' derive from the Koine Greek title ''Christós'' (Χρι ...
compilers. The text was arranged alphabetically with some slight deviations from common vowel order and place in the Greek alphabet. From India, the
Siribhoovalaya The ''Siribhoovalaya'' ( kn, ಸಿರಿಭೂವಲಯ) is a work of multi-lingual literature written by Kumudendu Muni, a Jain monk. The work is unique in that it employs not letters, but is composed entirely in Kannada numerals. The ''Sa ...
(Kannada: ಸಿರಿಭೂವಲಯ), dated between 800 A.D. to 15th century, is a work of
kannada Kannada (; ಕನ್ನಡ, ), originally romanised Canarese, is a Dravidian language spoken predominantly by the people of Karnataka in southwestern India, with minorities in all neighbouring states. It has around 47 million native s ...
literature written by
Kumudendu Muni Kumudendu Muni ( kn, ಕುಮುದೇಂದು ಮುನಿ) was a ''Digambara monk'' who authored Siribhoovalaya, a unique multi-lingual literary work. Scholars are divided about when he lived and not much is known about him. It is believed ...
, a Jain monk. It is unique because rather than employing alphabets, it is composed entirely in
Kannada numerals The Kannada script ( IAST: ''Kannaḍa lipi''; obsolete: Kanarese or Canarese script in English) is an abugida of the Brahmic family, used to write Kannada, one of the Dravidian languages of South India especially in the state of Karnataka ...
. Many philosophies which existed in the Jain classics are eloquently and skillfully interpreted in the work. The enormous encyclopedic work in China of the ''
Four Great Books of Song The ''Four Great Books of Song'' () was compiled by a team of scholars during the Song dynasty (960–1279). The term was coined after the last book ('' Cefu Yuangui'') was finished during the 11th century. The four encyclopedias were published an ...
'', compiled by the 11th century during the early
Song dynasty The Song dynasty (; ; 960–1279) was an imperial dynasty of China that began in 960 and lasted until 1279. The dynasty was founded by Emperor Taizu of Song following his usurpation of the throne of the Later Zhou. The Song conquered the rest ...
(960–1279), was a massive literary undertaking for the time. The last encyclopedia of the four, the ''
Prime Tortoise of the Record Bureau ''Cefu Yuangui'' (冊府元龜) is the largest ''leishu'' (encyclopedia) compiled during the Chinese Song Dynasty (AD 960–1279). It was the last of the '' Four Great Books of Song'', the previous three having been published in the 10th cen ...
'', amounted to 9.4 million
Chinese characters Chinese characters () are logograms developed for the writing of Chinese. In addition, they have been adapted to write other East Asian languages, and remain a key component of the Japanese writing system where they are known as ''kanji' ...
in 1,000 written volumes. There were many great encyclopedists throughout Chinese history, including the scientist and statesman Shen Kuo (1031–1095) with his ''
Dream Pool Essays ''The Dream Pool Essays'' (or ''Dream Torrent Essays'') was an extensive book written by the Chinese polymath and statesman Shen Kuo (1031–1095), published in 1088 during the Song dynasty (960–1279) of China. Shen compiled this encycloped ...
'' of 1088, the statesman, inventor, and agronomist Wang Zhen (active 1290–1333) with his ''Nong Shu'' of 1313, and the written ''Tiangong Kaiwu'' of
Song Yingxing Song Yingxing (Traditional Chinese: 宋應星; Simplified Chinese: 宋应星; Wade Giles: Sung Ying-Hsing; 1587-1666 AD) was a Chinese scientist and encyclopedist who lived during the late Ming Dynasty (1368–1644). He was the author of ''Tian ...
(1587–1666), the latter of whom was termed the " Diderot of China" by British historian
Joseph Needham Noel Joseph Terence Montgomery Needham (; 9 December 1900 – 24 March 1995) was a British biochemist, historian of science and sinologist known for his scientific research and writing on the history of Chinese science and technology, in ...
.Needham, Volume 5, Part 7, 102.


Printed encyclopedias

Before the advent of the printing press, encyclopedic works were all hand copied and thus rarely available, beyond wealthy patrons or monastic men of learning: they were expensive, and usually written for those extending knowledge rather than those using it. During the
Renaissance The Renaissance ( , ) , from , with the same meanings. is a period in European history marking the transition from the Middle Ages to modernity and covering the 15th and 16th centuries, characterized by an effort to revive and surpass ideas ...
, the creation of
printing Printing is a process for mass reproducing text and images using a master form or template. The earliest non-paper products involving printing include cylinder seals and objects such as the Cyrus Cylinder and the Cylinders of Nabonidus. The ea ...
allowed a wider diffusion of encyclopedias and every scholar could have his or her own copy. The ''
De expetendis et fugiendis rebus ''De expetendis et fugiendis rebus'' (On seeking and avoiding things) is an encyclopædia which was compiled by Giorgio Valla in 49 books. Valla died in 1500 and the work was then published by his adopted son, Giovanni Pietro in 1501. It wa ...
'' by
Giorgio Valla Giorgio Valla (Latin: ''Georgius Valla''; Piacenza 1447–Venice 1500) was an Italian academic, mathematician, philologist and translator. Life He was born in Piacenza in 1447. He was the son of Andrea Valla and Cornelia Corvini. At the age of ...
was posthumously printed in 1501 by Aldo Manuzio in
Venice Venice ( ; it, Venezia ; vec, Venesia or ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 small islands that are separated by canals and linked by over 400  ...
. This work followed the traditional scheme of liberal arts. However, Valla added the translation of ancient Greek works on mathematics (firstly by
Archimedes Archimedes of Syracuse (;; ) was a Greek mathematician, physicist, engineer, astronomer, and inventor from the ancient city of Syracuse in Sicily. Although few details of his life are known, he is regarded as one of the leading scientists ...
), newly discovered and translated. The ''Margarita Philosophica'' by
Gregor Reisch Gregor Reisch (c. 1467 - 9 May 1525) was a German Carthusian monk and humanist scholar. He is best known for his compilation ''Margarita Philosophica'', one of the earliest printed encyclopedias of general knowledge. Life Reisch was born at Balin ...
, printed in 1503, was a complete encyclopedia explaining the
seven liberal arts Liberal arts education (from Latin "free" and "art or principled practice") is the traditional academic course in Western higher education. ''Liberal arts'' takes the term '' art'' in the sense of a learned skill rather than specifically th ...
. Financial, commercial, legal, and intellectual factors changed the size of encyclopedias. Middle classes had more time to read and encyclopedias helped them to learn more. Publishers wanted to increase their output so some countries like Germany started selling books missing alphabetical sections, to publish faster. Also, publishers could not afford all the resources by themselves, so multiple publishers would come together with their resources to create better encyclopedias. Later, rivalry grew, causing copyright to occur due to weak underdeveloped laws. John Harris is often credited with introducing the now-familiar alphabetic format in 1704 with his English ''Lexicon Technicum: Or, A Universal English Dictionary of Arts and Sciences: Explaining not only the Terms of Art, but the Arts Themselves'' – to give its full title. Organized alphabetically, its content does indeed contain explanation not merely of the terms used in the arts and sciences, but of the arts and sciences themselves.
Sir Isaac Newton Sir Isaac Newton (25 December 1642 – 20 March 1726/27) was an English mathematician, physicist, astronomer, alchemist, theologian, and author (described in his time as a "natural philosopher"), widely recognised as one of the great ...
contributed his only published work on chemistry to the second volume of 1710.


Encyclopédie


Encyclopædia Britannica

The ''
Encyclopædia Britannica The (Latin for "British Encyclopædia") is a general knowledge English-language encyclopaedia. It is published by Encyclopædia Britannica, Inc.; the company has existed since the 18th century, although it has changed ownership various time ...
'', had a modest beginning in Scotland: the first edition, issued between 1768 and 1771, had just three hastily completed volumes – A–B, C–L, and M–Z – with a total of 2,391 pages. By 1797, when the third edition was completed, it had been expanded to 18 volumes addressing a full range of topics, with articles contributed by a range of authorities on their subjects. The ''Encyclopædia Britannica'' appeared in various editions throughout the nineteenth century, and the growth of
popular education Popular education is a concept grounded in notions of class, political struggle, and social transformation. The term is a translation from the Spanish educación popular or the Portuguese educação popular and rather than the English usage ...
and the Mechanics' Institutes, spearheaded by the
Society for the Diffusion of Useful Knowledge The Society for the Diffusion of Useful Knowledge (SDUK) was founded in London in 1826, mainly at the instigation of Whig MP Henry Brougham, with the object of publishing information to people who were unable to obtain formal teaching or who pr ...
led to the production of the ''
Penny Cyclopaedia ''The Penny Cyclopædia'' published by the Society for the Diffusion of Useful Knowledge was a multi-volume encyclopedia edited by George Long and published by Charles Knight alongside the '' Penny Magazine''. Twenty-seven volumes and three sup ...
'', as its title suggests issued in weekly numbers at a penny each like a newspaper. In the early 20th century, the ''Encyclopædia Britannica'' reached its eleventh edition, and inexpensive encyclopedias such as ''
Harmsworth's Universal Encyclopaedia ''Harmsworth's Universal Encyclopaedia'' is an encyclopedia edited by John Hammerton and published in London, England by The Education Book Co. Ltd., a subsidiary of Northcliffe's Amalgamated Press, in 1921/22. Aimed at a middle-income market ...
'' and ''
Everyman's Encyclopaedia ''Everyman's Encyclopaedia'' is an encyclopedia published by Joseph Dent from 1913 as part of the Everyman's Library. The set was descended from the 1850s ''English Cyclopaedia'' of 1854, which in turn was based on the ''Penny Cyclopaedia'' of ...
'' were common.


Brockhaus

The German-language '' Conversations-Lexikon'' was published at
Leipzig Leipzig ( , ; Upper Saxon: ) is the most populous city in the German state of Saxony. Leipzig's population of 605,407 inhabitants (1.1 million in the larger urban zone) as of 2021 places the city as Germany's eighth most populous, as wel ...
from 1796 to 1808, in 6 volumes. Paralleling other 18th century encyclopedias, its scope was expanded beyond that of earlier publications, in an effort at comprehensiveness. It was, however, intended not for scholarly use but to provide results of research and discovery in a simple and popular form without extensive detail. This format, a contrast to the ''Encyclopædia Britannica'', was widely imitated by later 19th century encyclopedias in Britain, the United States, France, Spain, Italy and other countries. Of the influential late-18th century and early-19th century encyclopedias, the ''Conversations-Lexikon'' is perhaps most similar in form to today's encyclopedias.


E.s in the US

In the United States, the 1950s and 1960s saw the introduction of several large popular encyclopedias, often sold on installment plans. The best known of these were ''
World Book The ''World Book Encyclopedia'' is an American encyclopedia. The encyclopedia is designed to cover major areas of knowledge uniformly, but it shows particular strength in scientific, technical, historical and medical subjects. ''World Book'' w ...
'' and ''
Funk and Wagnalls Funk & Wagnalls was an American publisher known for its reference works, including ''A Standard Dictionary of the English Language'' (1st ed. 1893–5), and the ''Funk & Wagnalls Standard Encyclopedia'' (25 volumes, 1st ed. 1912).Funk & Wagnalls N ...
''. As many as 90% were sold
door to door Door-to-door is a canvassing technique that is generally used for sales, marketing, advertising, evangelism or campaigning, in which the person or persons walk from the door of one house to the door of another, trying to sell or advertise a ...
. Jack Lynch says in his book ''You Could Look It Up'' that encyclopedia salespeople were so common that they became the butt of jokes. He describes their sales pitch saying, "They were selling not books but a lifestyle, a future, a promise of social mobility." A 1961 ''World Book'' ad said, "You are holding your family's future in your hands right now," while showing a feminine hand holding an order form.


Digital encyclopedias

By the late 20th century, encyclopedias were being published on
CD-ROM A CD-ROM (, compact disc read-only memory) is a type of read-only memory consisting of a pre-pressed optical compact disc that contains data. Computers can read—but not write or erase—CD-ROMs. Some CDs, called enhanced CDs, hold both comput ...
s for use with personal computers.
Microsoft Microsoft Corporation is an American multinational technology corporation producing computer software, consumer electronics, personal computers, and related services headquartered at the Microsoft Redmond campus located in Redmond, Washing ...
's ''
Encarta ''Microsoft Encarta'' is a discontinued digital multimedia encyclopedia published by Microsoft from 1993 to 2009. Originally sold on CD-ROM or DVD, it was also available on the World Wide Web via an annual subscription, although later articles ...
'', launched in 1993, was a landmark example as it had no printed equivalent. Articles were supplemented with video and audio files as well as numerous high-quality images. After sixteen years, Microsoft discontinued the Encarta line of products in 2009. Digital encyclopedias enable "Encyclopedia Services" (e.g.
Wikimedia Enterprise Wikimedia Enterprise is a commercial product by the Wikimedia Foundation to provide, in a more easily consumable way, the data of the Wikimedia projects, including Wikipedia. It allows customers to retrieve data at large scale and high availability ...
) to facilitate programatic access to the content.


Free encyclopedias

The concept of a free encyclopedia began with the
Interpedia Interpedia was the first-proposed online encyclopedia which would allow anyone to contribute by writing articles and submitting them to the central catalogue of all Interpedia pages. History Interpedia was initiated by Rick Gates, who posted a ...
proposal on
Usenet Usenet () is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture. Tom Truscott and Jim Ellis conceived the idea in 1979, and it was ...
in 1993, which outlined an Internet-based
online encyclopedia An online encyclopedia, also called an Internet encyclopedia, or a digital encyclopedia, is an encyclopedia accessible through the internet. Examples include Wikipedia and ''Encyclopædia Britannica''. Digitization of old content In January 199 ...
to which anyone could submit content and that would be freely accessible. Early projects in this vein included
Everything2 Everything2 (styled Everything2 or E2 for short) is a collaborative Web-based community consisting of a database of interlinked user-submitted written material. E2 is moderated for quality, but has no formal policy on subject matter. Writing on ...
and
Open Site Open-Site, the Open Encyclopedia Project was a free internet encyclopedia operated by Michael J. Flickinger in an effort to build a free categorized community-built encyclopedia, inspired by DMOZ. The Open Site software was open-source software ...
. In 1999,
Richard Stallman Richard Matthew Stallman (; born March 16, 1953), also known by his initials, rms, is an American free software movement activist and programmer. He campaigns for software to be distributed in such a manner that its users have the freedom to ...
proposed the
GNUPedia GNE (originally GNUPedia) was a project to create a free content online encyclopedia, licensed under the GNU Free Documentation License, under the auspices of the Free Software Foundation. The project was proposed by Richard Stallman in Decemb ...
, an online encyclopedia which, similar to the
GNU operating system GNU () is an extensive collection of free software (383 packages as of January 2022), which can be used as an operating system or can be used in parts with other operating systems. The use of the completed GNU tools led to the family of operat ...
, would be a "generic" resource. The concept was very similar to Interpedia, but more in line with Stallman's
GNU GNU () is an extensive collection of free software (383 packages as of January 2022), which can be used as an operating system or can be used in parts with other operating systems. The use of the completed GNU tools led to the family of operat ...
philosophy. It was not until
Nupedia Nupedia was an English-language, online encyclopedia whose articles were written by volunteer contributors with appropriate subject matter expertise, reviewed by expert editors before publication, and licensed as free content. It was founded by ...
and later
Wikipedia Wikipedia is a multilingual free online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and using a wiki-based editing system. Wikipedia is the largest and most-read refer ...
that a stable free encyclopedia project was able to be established on the Internet. The
English Wikipedia The English Wikipedia is, along with the Simple English Wikipedia, one of two English-language editions of Wikipedia, an online encyclopedia. It was founded on January 15, 2001, as Wikipedia's first edition, and, as of , has the most arti ...
, which was started in 2001, became the world's largest encyclopedia in 2004 at the 300,000 article stage. By late 2005, Wikipedia had produced over two million articles in more than 80 languages with content licensed under the
copyleft Copyleft is the legal technique of granting certain freedoms over copies of copyrighted works with the requirement that the same rights be preserved in derivative works. In this sense, ''freedoms'' refers to the use of the work for any purpose, ...
GNU Free Documentation License The GNU Free Documentation License (GNU FDL or simply GFDL) is a copyleft license for free documentation, designed by the Free Software Foundation (FSF) for the GNU Project. It is similar to the GNU General Public License, giving readers the r ...
. As of August 2009, Wikipedia had over 3 million articles in English and well over 10 million combined in over 250 languages. Wikipedia currently has articles in English. Since 2003, other free encyclopedias like the Chinese-language
Baidu Baike Baidu Baike (; , also known as Baidu Wiki) is a semi-regulated Chinese-language collaborative online encyclopedia owned by the Chinese technology company Baidu. The beta version was launched on April 20, 2006, and the official version was lau ...
and
Hudong Baike.com (), formerly Hudong and Hoodong (), is a for-profit social network in Chinese, including the world's largest Chinese encyclopedia. It is one of the two largest wikis in China, along with Baidu Baike, claiming to have more than 18 mill ...
, as well as English language encyclopedias such as
Citizendium Citizendium ( ; "the citizens' compendium of everything") is an English-language wiki-based free online encyclopedia launched by Larry Sanger, co-founder of Nupedia and Wikipedia. It was first announced in September 2006 as a fork of the Engli ...
and
Knol Knol was a Google project that aimed to include user-written articles on a range of topics. The lower-case term ''knol'', which Google defined as a "unit of knowledge", referred to an article in the project. Knol was often viewed as a rival to W ...
have appeared, the latter of which has been discontinued.


Online encyclopedias

In January 1995,
Project Gutenberg Project Gutenberg (PG) is a Virtual volunteering, volunteer effort to digitize and archive cultural works, as well as to "encourage the creation and distribution of eBooks." It was founded in 1971 by American writer Michael S. Hart and is the ...
started to publish the
ASCII ASCII ( ), abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices. Because of ...
text of the ''
Encyclopædia Britannica The (Latin for "British Encyclopædia") is a general knowledge English-language encyclopaedia. It is published by Encyclopædia Britannica, Inc.; the company has existed since the 18th century, although it has changed ownership various time ...
'', 11th edition (1911), but disagreement about the method halted the work after the first volume. For trademark reasons this has been published as the ''
Gutenberg Encyclopedia Johannes Gensfleisch zur Laden zum Gutenberg (; – 3 February 1468) was a German inventor and craftsman who introduced letterpress printing to Europe with his movable-type printing press. Though not the first of its kind, earlier designs ...
''. Project Gutenberg later restarted work on digitising and proofreading this encyclopedia. Project Gutenberg has published volumes in alphabetic order the most recent publication is ''Volume 17 Slice 8: Matter–Mecklenburg'' published on 7 April 2013. The latest ''Britannica'' was digitized by its publishers, and sold first as a CD-ROM, and later as an online service. In 2001, ASCII text of all 28 volumes was published on ''Encyclopædia Britannica'' Eleventh Edition by source; a copyright claim was added to the materials included. The website no longer exists, but the contents are available from the
Internet Archive The Internet Archive is an American digital library with the stated mission of "universal access to all knowledge". It provides free public access to collections of digitized materials, including websites, software applications/games, music, ...
. Other digitization projects have made progress in other titles. One example is ''
Easton's Bible Dictionary (1897) The ''Illustrated Bible Dictionary'', better known as ''Easton's Bible Dictionary'', is a reference work on topics related to the Christianity, Christian Bible, compiled by Matthew George Easton. The first edition was published in 1893, and a r ...
'' digitized by the
Christian Classics Ethereal Library The Christian Classics Ethereal Library (CCEL) is a digital library that provides free electronic copies of Christian scripture and literature texts. Description CCEL is a volunteer-based project founded and directed by Harry Plantinga, a pro ...
. A successful digitization of an encyclopedia was the
Bartleby Project John Taylor Gatto (December 15, 1935 – October 25, 2018) was an American author and school teacher. After teaching for nearly 30 years he authored several books on modern education, criticizing its ideology, history, and consequences. He is b ...
's online adaptation of the ''
Columbia Encyclopedia The ''Columbia Encyclopedia'' is a one-volume encyclopedia produced by Columbia University Press and, in the last edition, sold by the Gale Group. First published in 1935, and continuing its relationship with Columbia University, the encyclopedi ...
'', Sixth Edition, in early 2000 and is updated periodically. Other websites provide online encyclopedias, some of which are also available on Wikisource, but which may be more complete than those on Wikisource, or maybe different editions (see List of online encyclopedias). Another related branch of activity is the creation of new, free content on a volunteer basis. In 1991, the participants of the
Usenet Usenet () is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture. Tom Truscott and Jim Ellis conceived the idea in 1979, and it was ...
newsgroup started a project to produce a real version of ''
The Hitchhiker's Guide to the Galaxy ''The Hitchhiker's Guide to the Galaxy'' (sometimes referred to as ''HG2G'', ''HHGTTG'', ''H2G2'', or ''tHGttG'') is a comic science fiction, comedy science fiction franchise created by Douglas Adams. Originally The Hitchhiker's Guide to th ...
'', a fictional encyclopedia used in the works of
Douglas Adams Douglas Noel Adams (11 March 1952 – 11 May 2001) was an English author and screenwriter, best known for ''The Hitchhiker's Guide to the Galaxy''. Originally a 1978 The Hitchhiker's Guide to the Galaxy (radio series), BBC radio comedy, ''The H ...
. It became known as Project Galactic Guide. Although it originally aimed to contain only real, factual articles, the policy was changed to allow and encourage semi-real and unreal articles as well. Project Galactic Guide contains over 1700 articles, but no new articles have been added since 2000; this is probably partly due to the founding of
h2g2 The h2g2 website is a British-based collaborative online encyclopedia project. It describes itself as "an unconventional guide to life, the universe, and everything", in the spirit of the fictional publication '' The Hitchhiker's Guide to ...
, a more official project along similar lines. The 1993
Interpedia Interpedia was the first-proposed online encyclopedia which would allow anyone to contribute by writing articles and submitting them to the central catalogue of all Interpedia pages. History Interpedia was initiated by Rick Gates, who posted a ...
proposal was planned as an encyclopedia on the Internet to which everyone could contribute materials. The project never left the planning stage and was overtaken by a key branch of old printed encyclopedias. Another early online encyclopedia was called the ''Global Encyclopedia''. In November 1995 a review of it was presented by James Rettig (Assistant Dean of University Libraries for Reference and Information Services)
College of William & Mary The College of William & Mary (officially The College of William and Mary in Virginia, abbreviated as William & Mary, W&M) is a public research university in Williamsburg, Virginia. Founded in 1693 by letters patent issued by King William III ...
at the 15th Annual Charleston Conference on library acquisitions and related issues. He said of the ''Global Encyclopedia'': He then gives several examples of article entries such as
Iowa City Iowa City, offically the City of Iowa City is a city in Johnson County, Iowa, United States. It is the home of the University of Iowa and county seat of Johnson County, at the center of the Iowa City Metropolitan Statistical Area. At the time ...
:
Wikipedia Wikipedia is a multilingual free online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and using a wiki-based editing system. Wikipedia is the largest and most-read refer ...
is a free content, multilingual online encyclopedia written and maintained by a community of volunteer contributors through a model of
open collaboration Open collaboration is any "system of innovation or production that relies on goal-oriented yet loosely coordinated participants who interact to create a product (or service) of economic value, which is made available to contributors and noncontribu ...
. It is the largest and most-read
reference work A reference work is a work, such as a paper, book or periodical (or their electronic equivalents), to which one can refer for information. The information is intended to be found quickly when needed. Such works are usually ''referred'' to f ...
in history. Wikipedia originally developed from another encyclopedia project called
Nupedia Nupedia was an English-language, online encyclopedia whose articles were written by volunteer contributors with appropriate subject matter expertise, reviewed by expert editors before publication, and licensed as free content. It was founded by ...
.


CD-ROM encyclopedias

A CD-ROM encyclopedia is an encyclopedia delivered as
reference software {{Unreferenced, date=September 2007 Reference software is software which emulates and expands upon print reference forms including the dictionary, translation dictionary, encyclopaedia, thesaurus, and atlas. Like print references, reference softwa ...
on a
CD-ROM A CD-ROM (, compact disc read-only memory) is a type of read-only memory consisting of a pre-pressed optical compact disc that contains data. Computers can read—but not write or erase—CD-ROMs. Some CDs, called enhanced CDs, hold both comput ...
disc for use on a
personal computer A personal computer (PC) is a multi-purpose microcomputer whose size, capabilities, and price make it feasible for individual use. Personal computers are intended to be operated directly by an end user, rather than by a computer expert or tec ...
. This was the usual way computer users accessed encyclopedic knowledge from the 1980s and 1990s. Later
DVD The DVD (common abbreviation for Digital Video Disc or Digital Versatile Disc) is a digital optical disc data storage format. It was invented and developed in 1995 and first released on November 1, 1996, in Japan. The medium can store any kind ...
discs replaced CD-ROMs and from mid-2000s
internet encyclopedias An encyclopedia (American English) or encyclopædia (British English) is a reference work or compendium providing summaries of knowledge either general or special to a particular field or discipline. Encyclopedias are divided into articles ...
became dominant and replaced disc-based software encyclopedias. Some examples of CD-ROM encyclopedia are ''
Encarta ''Microsoft Encarta'' is a discontinued digital multimedia encyclopedia published by Microsoft from 1993 to 2009. Originally sold on CD-ROM or DVD, it was also available on the World Wide Web via an annual subscription, although later articles ...
'',
Grolier Grolier was one of the largest American publishers of general encyclopedias, including '' The Book of Knowledge'' (1910), ''The New Book of Knowledge'' (1966), ''The New Book of Popular Science'' (1972), ''Encyclopedia Americana'' (1945), ''Acad ...
Multimedia Encyclopedia, and ''Britannica''. CD-ROM encyclopedias were usually a
macOS macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and lapt ...
or
Microsoft Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for serv ...
(3.0, 3.1 or 95/98) application on a CD-ROM disc. The user would execute the encyclopedia's software program to see a menu that allowed them to start browsing the encyclopedia's articles, and most encyclopedias also supported a way to search the contents of the encyclopedia. The article text was usually
hyperlinked ''Hyperlinked'' is an American semi-autobiography streaming television series produced exclusively for YouTube Premium, featuring the now-disbanded music group L2M. The series was created by Juliette Brindak Blake, Hermine Brindak and Larry Re ...
and also included
photographs A photograph (also known as a photo, image, or picture) is an image created by light falling on a photosensitive surface, usually photographic film or an electronic image sensor, such as a CCD or a CMOS chip. Most photographs are now created ...
,
audio Audio most commonly refers to sound, as it is transmitted in signal form. It may also refer to: Sound * Audio signal, an electrical representation of sound *Audio frequency, a frequency in the audio spectrum * Digital audio, representation of sou ...
clips (for example in articles about historical speeches or musical instruments), and
video clips Video clips refer to mostly short videos, most of the time called memes, which are short videos of silly jokes and funny clips, most of the time coming from movies or any entertainment videos such as YouTube. The term is also used more loosely to ...
. In the CD-ROM age the video clips had usually a low resolution, often 160x120 or 320x240 pixels. Such encyclopedias which made use of photos, audio and video were also called multimedia encyclopedias. However, because of the
online encyclopedia An online encyclopedia, also called an Internet encyclopedia, or a digital encyclopedia, is an encyclopedia accessible through the internet. Examples include Wikipedia and ''Encyclopædia Britannica''. Digitization of old content In January 199 ...
, CD-ROM encyclopedias have been declared obsolete.


See also

*
Bibliography of encyclopedias This is intended to be as comprehensive as possible list of encyclopedias and encyclopedic/biographical dictionaries ever published in any language. The list will not include reprinted editions but it is intended to list an alphabetical bibliograp ...
*
Biographical dictionary A biographical dictionary is a type of encyclopedic dictionary limited to biographical information. Many attempt to cover the major personalities of a country (with limitations, such as living persons only, in ''Who's Who'', or deceased people onl ...
*
Encyclopedic knowledge To have encyclopedic knowledge is to have "vast and complete" knowledge about a large number of diverse subjects. A person having such knowledge is called a human encyclopedia or a walking encyclopedia. The concept of encyclopedic knowledge was ...
*
Encyclopedism Encyclopedism is an outlook that aims to include a wide range of knowledge in a single work. The term covers both encyclopedias themselves and related genres in which comprehensiveness is a notable feature. The word encyclopedia is a Latinization ...
*
Fictitious entry Fictitious or fake entries are deliberately incorrect entries in reference works such as dictionaries, encyclopedias (including Wikipedia), maps, and directories. There are more specific terms for particular kinds of fictitious entry, such as Mo ...
*
History of science and technology The history of science and technology (HST) is a field of history that examines the understanding of the natural world (science) and the ability to manipulate it (technology) at different points in time. This academic discipline also studies the c ...
*
Lexicography Lexicography is the study of lexicons, and is divided into two separate academic disciplines. It is the art of compiling dictionaries. * Practical lexicography is the art or craft of compiling, writing and editing dictionaries. * Theoretica ...
*
Library science Library science (often termed library studies, bibliothecography, and library economy) is an interdisciplinary or multidisciplinary field that applies the practices, perspectives, and tools of management, information technology, education, an ...
*
Lists of encyclopedias For lists of encyclopedias, see: * List of encyclopedias by branch of knowledge * List of encyclopedias by date * List of encyclopedias by language * List of online encyclopedias See also * Bibliography of encyclopedias * List of almanacs * ...
*
Thesaurus A thesaurus (plural ''thesauri'' or ''thesauruses'') or synonym dictionary is a reference work for finding synonyms and sometimes antonyms of words. They are often used by writers to help find the best word to express an idea: Synonym diction ...
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Speculum literature The medieval genre of speculum literature, popular from the twelfth through the sixteenth centuries, was inspired by the urge to encompass encyclopedic knowledge within a single work. However, some of these works have a restricted scope and func ...


Notes


References

* * * * C. Codoner, S. Louis, M. Paulmier-Foucart, D. Hüe, M. Salvat, A. Llinares, ''L'Encyclopédisme. Actes du Colloque de Caen'', A. Becq (dir.), Paris, 1991. * * * * * * * * * * * * *


External links


Encyclopaedia and Hypertext


– Biographical errors in encyclopedias and almanacs
Encyclopedia
– Diderot's article on the Encyclopedia from the original
Encyclopédie ''Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métiers'' (English: ''Encyclopedia, or a Systematic Dictionary of the Sciences, Arts, and Crafts''), better known as ''Encyclopédie'', was a general encyclopedia publis ...
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De expetendis et fugiendis rebus
– First Renaissance encyclopedia

* ttps://web.archive.org/web/20131109213126/http://reviews.cnet.com/1990-3118_7-6378998-1.html Digital encyclopedias put the world at your fingertips
CNET ''CNET'' (short for "Computer Network") is an American media website that publishes reviews, news, articles, blogs, podcasts, and videos on technology and consumer electronics globally. ''CNET'' originally produced content for radio and televi ...
article
Encyclopedias online
University of Wisconsin Stout listing by category
Chambers' ''Cyclopaedia''
1728, with the 1753 supplement
''Encyclopædia Americana''
1851,
Francis Lieber Francis Lieber (March 18, 1798 or 1800 – October 2, 1872), known as Franz Lieber in Germany, was a German-American jurist, gymnast and political philosopher. He edited an ''Encyclopaedia Americana''. He was the author of the Lieber Code during ...
ed. (Boston: Mussey & Co.) at the University of Michigan Making of America site
''Encyclopædia Britannica''
articles and illustrations from 9th ed., 1875–89, and 10th ed., 1902–03. * {{Authority control Works about history