noun Linguistics. 1.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. 2.any of a
set of phonetic properties, as coronal, nasal, or strident, serving as a basic unit of phonological analysis by which the sounds that are significant in a language can be characterized and distinguished from one another.
3.a component or phonetic feature characterizing a phoneme.