consonancy

con=so=nan=cy

CIDE DICTIONARY

consonancy, n. [L. consonantia: cf. F. consonnance.].

Accord or agreement of sounds produced simultaneously, as a note with its third, fifth, and eighth. [1913 Webster]
Agreement or congruity; harmony; accord; consistency; suitableness. [1913 Webster]
"The perfect consonancy of our persecuted church to the doctrines of Scripture and antiquity." [1913 Webster]

"The optic nerve responds to the waves with which it is in consonance." [1913 Webster]
Friendship; concord. [1913 Webster]
"By the consonancy of our youth."

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