Unison

n.	1.	Harmony; agreement; concord; union.
	2.	(Mus.) Identity in pitch; coincidence of sounds proceeding from an equality in the number of vibrations made in a given time by two or more sonorous bodies. Parts played or sung in octaves are also said to be in unison, or in octaves.
	3.	A single, unvaried. In unison in agreement; agreeing in tone; in concord.
a.	1.	Sounding alone. [sounds] intermixed with voice, Choral or unison. - Milton.
	2.	(Mus.) Sounded alike in pitch; unisonant; unisonous; as, unison passages, in which two or more parts unite in coincident sound.

Noun	1.	unison - corresponding exactly; "marching in unison"
	2.	unison - occurring together or simultaneously; "the two spoke in unison"
	3.	unison - (music) two or more sounds or tones at the same pitch or in octaves; "singing in unison"

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