(in English articulation) a speech sound produced by occluding with or without releasing (p, b; t, d; k, g), diverting (m, n, ng), or obstructing (f, v; s, z, etc.) the flow of air from the lungs (opposed to vowel).
b.
(in a syllable) any sound other than the sound of greatest sonority in the syllable, as b, r, and g in brig (opposed to sonant). Compare vowel(def. 1b).
c.
(in linguistic function) a concept empirically determined as a phonological element in structural contrast with vowel, as the b of be, the w of we, the y, s, and t of yeast, etc.
2.
a letter that usually represents a consonant sound.
adjective
3.
in agreement; agreeable; in accord; consistent (usually followed by to or with): behavior consonant with his character.
Origin: 1350–1400; Middle English consona(u)nt (< Anglo-French ) < Latin consonant- (stem of consonāns, present participle of consonāre to sound with or together). See con-, sonant
c.1300, from L. consonantem (nom. consonans), prp. of consonare "to sound together," from com- "with" + sonare, from sonus "sound" (see sound (n.1)). Consonants thought of as sounds that are only produced together with vowels.