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The Collaborative International Dictionary
Consonancy

Consonance \Con"so*nance\, Consonancy \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.

Wiktionary
consonancy

n. (context obsolete English) consistency; congruity

Usage examples of "consonancy".

But let me conjure you, bythe rights of our fellowship, by the consonancy ofour youth, by the obligation of our ever-preservedlove, and by what more dear a better proposer couldcharge you withal, be even and direct with me,whether you were sent for, or no?