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In
phonology Phonology is the branch of linguistics that studies how languages or dialects systematically organize their sounds or, for sign languages, their constituent parts of signs. The term can also refer specifically to the sound or sign system of a ...
, a natural class is a set of
phoneme In phonology and linguistics, a phoneme () is a unit of sound that can distinguish one word from another in a particular language. For example, in most dialects of English, with the notable exception of the West Midlands and the north-wes ...
s in a language that share certain
distinctive feature In linguistics, a distinctive feature is the most basic unit of phonological structure that distinguishes one sound from another within a language. For example, the feature oicedistinguishes the two bilabial plosives: and There are many diff ...
s. A natural class is determined by participation in shared
phonological process A phonological rule is a formal way of expressing a systematic phonological or morphophonological process or diachronic sound change in language. Phonological rules are commonly used in generative phonology as a notation to capture sound-related ...
es, described using the minimum number of features necessary for descriptive adequacy.


Overview

Classes are defined by distinctive features having reference to articulatory and acoustic phonetic properties, including manners of articulation,
places of articulation In articulatory phonetics, the place of articulation (also point of articulation) of a consonant is a location along the vocal tract where its production occurs. It is a point where a constriction is made between an active and a passive articula ...
, voicing, and continuance. For example, the set containing the sounds , , and is a natural class of
voiceless In linguistics, voicelessness is the property of sounds being pronounced without the larynx vibrating. Phonologically, it is a type of phonation, which contrasts with other states of the larynx, but some object that the word phonation implies ...
stops in American Standard English. This class is one of several other classes, including the
voiced Voice or voicing is a term used in phonetics and phonology to characterize speech sounds (usually consonants). Speech sounds can be described as either voiceless (otherwise known as ''unvoiced'') or voiced. The term, however, is used to refer ...
stops (/b/, /d/, and /g/), voiceless
fricatives A fricative is a consonant produced by forcing air through a narrow channel made by placing two articulators close together. These may be the lower lip against the upper teeth, in the case of ; the back of the tongue against the soft palate in t ...
(/f/, /θ/, /s/, /ʃ/, and /h/),
sonorant In phonetics and phonology, a sonorant or resonant is a speech sound that is produced with continuous, non-turbulent airflow in the vocal tract; these are the manners of articulation that are most often voiced in the world's languages. Vowels ar ...
s, and
vowel A vowel is a syllabic speech sound pronounced without any stricture in the vocal tract. Vowels are one of the two principal classes of speech sounds, the other being the consonant. Vowels vary in quality, in loudness and also in quantity (len ...
s. To give a further example, the system of Chomsky and Halle defines the class of voiceless stops by the specification of two binary features: continuant.html"_;"title="continuant.html"_;"title="continuant">continuant">continuant.html"_;"title="continuant">continuantand_[-voice_(phonetics).html" "title="continuant">continuant.html" ;"title="continuant.html" ;"title="continuant">continuant">continuant.html" ;"title="continuant">continuantand [-voice (phonetics)">voice The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound producti ...
]. Any sound with both the feature [-continuant] (not able to be pronounced continuously) and the feature [-voice] (not pronounced with vibration of the vocal cords) is included in the class, thus specifying all and only the voiceless stops. By implication, the class is also described as ''not'' having the features
continuant In phonetics, a continuant is a speech sound produced without a complete closure in the oral cavity, namely fricatives, approximants, vowels, and trills. While vowels are included in continuants, the term is often reserved for consonant sound ...
or
voice The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound producti ...
This means that all sounds with either the feature
continuant In phonetics, a continuant is a speech sound produced without a complete closure in the oral cavity, namely fricatives, approximants, vowels, and trills. While vowels are included in continuants, the term is often reserved for consonant sound ...
(able to be lengthened in pronunciation) or
voice The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound producti ...
(pronounced with vibration of the vocal cords) are excluded from the class. This excludes all natural classes of sounds besides voiceless stops. For instance, it excludes voiceless fricatives, which have the feature
continuant In phonetics, a continuant is a speech sound produced without a complete closure in the oral cavity, namely fricatives, approximants, vowels, and trills. While vowels are included in continuants, the term is often reserved for consonant sound ...
voiced stops, which have the feature
voice The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound producti ...
and
liquid A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, it is one of the four fundamental states of matter (the others being solid, gas, ...
s and
vowel A vowel is a syllabic speech sound pronounced without any stricture in the vocal tract. Vowels are one of the two principal classes of speech sounds, the other being the consonant. Vowels vary in quality, in loudness and also in quantity (len ...
s, which have the features
continuant In phonetics, a continuant is a speech sound produced without a complete closure in the oral cavity, namely fricatives, approximants, vowels, and trills. While vowels are included in continuants, the term is often reserved for consonant sound ...
and
voice The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound producti ...
Voiceless stops also have other, redundant, features, such as consonantaland
lateral Lateral is a geometric term of location which may refer to: Healthcare *Lateral (anatomy), an anatomical direction * Lateral cricoarytenoid muscle * Lateral release (surgery), a surgical procedure on the side of a kneecap Phonetics *Lateral co ...
]. These are not relevant to the description of the class and are unnecessary, since the features [-continuant] and [-voice] already include all voiceless stops and exclude all other sounds. It is expected that members of a natural class will behave similarly in the same
phonetic environment In phonetics and linguistics the phonetic environment refers to the surrounding sounds of a target speech sound, or target phone, in a word. The phonetic environment of a phone can sometimes determine the allophonic or phonemic qualities of a sound ...
, and will have a similar effect on sounds that occur in their environment.


References


External links


Glossary of linguistic terms: What is a natural class?
{{DEFAULTSORT:Natural Class Phonology