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unison

Syllabification: (u·ni·son)

Definition of unison

1simultaneous performance of action or utterance of speech:“Yes, sir,” said the girls in unison

2 Music 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 (especially when singing) in octaves:good unisons are formed by flutes, oboes, and clarinets

[attributive]

Derivatives

late Middle English (unison (sense 2 of the noun)): from Old French, or from late Latin unisonus, from Latin uni- 'one' + sonus 'sound'

Definition of unison in the British & World English dictionary

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