{ Con"so*nance (?), Con"so*nan*cy (?) }, n. [L. consonantia: cf. F. consonnance.] 1. (Mus.) Accord or agreement of sounds produced simultaneously, as a note with its third, fifth, and eighth.

2. Agreement or congruity; harmony; accord; consistency; suitableness.

The perfect consonancy of our persecuted church to the doctrines of Scripture and antiquity.
Hammond.

The optic nerve responds to the waves with which it is in consonance.
Tyndall.

3. Friendship; concord. [Obs.]

By the consonancy of our youth.
Shak.

Syn. -- Agreement; accord; consistency; unison; harmony; congruity; suitableness; agreeableness.