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Definition of: unison
(y
′nə·sən, -zən) noun 
1. A condition of perfect agreement and accord; harmony. 
2. Colloq. Of or having to do with unisex. or voices perform the same part; unity of pitch; also, the interval of one or more octaves. See synonyms under HARMONY, MELODY. [<L unisonus having a single sound <uni- one + sonus a sound]
				
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