unison

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u·ni·son / ˈyoōnəsən; -zən/ • n. 1. simultaneous performance of action or utterance of speech: “Yes, sir,” said the girls in unison. 2. Mus. coincidence in pitch of sounds or notes: the flutes play in unison with the violas. ∎  a combination of notes, voices, or instruments at the same pitch or (esp. when singing) in octaves: good unisons are formed by flutes, oboes, and clarinets.• adj. performed in unison.DERIVATIVES: u·nis·o·nous / yoōˈnisənəs/ adj.

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