: a speech sound (such as /p/, /d/, or /s/) that is made by partly or completely stopping the flow of air breathed out from the mouth
: a letter that represents a consonant; especially : any letter of the English alphabet except a, e, i, o, u, and sometimes y
Full Definition of CONSONANT
: one of a class of speech sounds (as \p\, \g\, \n\, \l\, \s\, \r\) characterized by constriction or closure at one or more points in the breath channel; also: a letter representing a consonant —usually used in English of any letter except a, e, i, o, and u
Any speech sound characterized by an articulation in which a closure or narrowing of the vocal tract completely or partially blocks the flow of air; also, any letter or symbol representing such a sound. Consonants are usually classified according to the place of articulation (e.g., palate, teeth, lips); the manner of articulation, as in stops (complete closure of the oral passage, released with a burst of air), fricatives (forcing of breath through a constricted passage), and trills (vibration of the tip of the tongue or the uvula); and the presence or absence of voicing, nasalization, aspiration, and other features.