
In linguistics, a distinctive feature is the most basic unit of phonological structure that may be analyzed in phonological theory. Distinctive features are grouped into categories according to the natural classes of segments they describe: major class features, laryngeal features, manner features, and place features. These feature categories in t...
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http://en.wikipedia.org/wiki/Distinctive_feature

Distinctive features are a way of analysing speech sounds in terms of a certain number of on/off elements. So the /b/ in English bass has the feature +voice, the /p/ of piano has the feature -voice, and so on.
Found on
http://www.viviancook.uk/Linguistics/LinguisticsGlossary.htm

a feature of the sound system of a language that serves as the crucial distinguishing mark between two phonemes, as the distinctive feature of voicing, which distinguishes b from p in English, or nasality, which distinguishes m from b and p. · any of a set of phonetic properties, as coronal, nasal, or strident, serving as a basic unit of ph...
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https://www.infoplease.com/dictionary/distinctive-feature
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