(1):

(a.) Having agreement; congruous; consistent; according; - usually followed by with or to.

(2):

(a.) Having like sounds.

(3):

(n.) An articulate sound which in utterance is usually combined and sounded with an open sound called a vowel; a member of the spoken alphabet other than a vowel; also, a letter or character representing such a sound.

(4):

(a.) Of or pertaining to consonants; made up of, or containing many, consonants.

(5):

(a.) harmonizing together; accordant; as, consonant tones, consonant chords.