Numerus Apertus
Numerus (Latin: "number") may refer to one of the following *Grammatical number * Numerus, a military unit of the Roman army ;See also: *Roman numerals Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers are written with combinations of letters from the Latin alphabet, eac ...

Latin Language
Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area around Rome, Italy. Through the expansion of the Roman Republic, it became the dominant language in the Italian Peninsula and subsequently throughout the Roman Empire. It has greatly influenced many languages, Latin influence in English, including English, having contributed List of Latin words with English derivatives, many words to the English lexicon, particularly after the Christianity in Anglo-Saxon England, Christianization of the Anglo-Saxons and the Norman Conquest. Latin Root (linguistics), roots appear frequently in the technical vocabulary used by fields such as theology, List of Latin and Greek words commonly used in systematic names, the sciences, List of medical roots, suffixes and prefixes, medicine, and List of Latin legal terms ...
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Number
A number is a mathematical object used to count, measure, and label. The most basic examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers can be represented in language with number words. More universally, individual numbers can be represented by symbols, called ''numerals''; for example, "5" is a numeral that represents the number five. As only a relatively small number of symbols can be memorized, basic numerals are commonly organized in a numeral system, which is an organized way to represent any number. The most common numeral system is the Hindu–Arabic numeral system, which allows for the representation of any Integer, non-negative integer using a combination of ten fundamental numeric symbols, called numerical digit, digits. In addition to their use in counting and measuring, numerals are often used for labels (as with telephone numbers), for ordering (as with serial numbers), and for codes (as with ISBNs). In common usage, a ''numeral'' is not clearly dist ...
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Grammatical Number
In linguistics, grammatical number is a Feature (linguistics), feature of nouns, pronouns, adjectives and verb agreement (linguistics), agreement that expresses count distinctions (such as "one", "two" or "three or more"). English and many other languages present number categories of singular or plural. Some languages also have a Dual (grammatical number), dual, #Trial, trial and #Paucal, paucal number or other arrangements. The word "number" is also used in linguistics to describe the distinction between certain grammatical aspects that indicate the number of times an event occurs, such as the semelfactive aspect, the iterative aspect, etc. For that use of the term, see "Grammatical aspect". Overview Most languages of the world have formal means to express differences of number. One widespread distinction, found in English and many other languages, involves a simple two-way contrast between singular and plural number (''car''/''cars'', ''child''/''children'', etc.). Discussion ...
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Numerus (Roman Military Unit)
A ''numerus'' (, plural ''numeri'') was a unit of the Roman army. In the Imperial Roman army (27 BC – 476 AD), it referred to units of barbarian allies who were not integrated into the regular army structure of legions and auxilia. Such units were of undetermined strength and their organisation and equipment probably varied according to the unit's ethnic origin. The term was also applied to quasi-permanent detachments of regular army units.Reuter, Marcus (1999). "Studien zu den numeri des römischen Heeres in der mittleren Kaiserzeit". In: ''Bericht der Römisch-Germanischen Kommission'', vol. 80, pp. 357–569. In the Late Roman army (284 – 476), a ''numerus'' was a regular infantry unit of the ''limitanei'', or border forces, believed to have been c. 300 strong. See also * Foederati ''Foederati'' ( ; singular: ''foederatus'' ) were peoples and cities bound by a treaty, known as ''foedus'', with Rome. During the Roman Republic, the term identified the '' socii' ...
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Roman Army
The Roman army () served ancient Rome and the Roman people, enduring through the Roman Kingdom (753–509 BC), the Roman Republic (509–27 BC), and the Roman Empire (27 BC–AD 1453), including the Western Roman Empire (collapsed Fall of the Western Roman Empire, AD 476/480) and the Byzantine Empire, Eastern Roman Empire (collapsed Fall of Constantinople, AD 1453). It is thus a term that broadly spans approximately 2,206 years, during which the force underwent numerous permutations in Size of the Roman army, size, Military of ancient Rome, composition, Structural history of the Roman military, organization, Roman military equipment, equipment and Strategy of the Roman military, tactics, while conserving a core of lasting traditions. Early Roman army (c. 550 – c. 300 BC) Until , there was no "national" Roman army, but a series of clan-based war-bands which only coalesced into a united force in periods of serious external threat. Around 550 BC, during the period conventiona ...
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