Definition of unison noun from the Oxford Advanced Learner's Dictionary

 

unison

 noun
noun
BrE BrE//ˈjuːnɪsn//
 
; NAmE NAmE//ˈjuːnɪsn//
 
 
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Word Origin late Middle English (originally as a musical term): from Old French, or from late Latin unisonus, from Latin uni- ‘one’ + sonus ‘sound’.Extra examples If the Security Council members act in unison, they may prevent an outbreak of war in the region. The oboe was in unison with the clarinet. They moved in perfect unison.Idioms
    in unison (with somebody/something)
     
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  1. 1if people do or say something in unison, they all do it at the same time
  2. 2if people or organizations are working in unison, they are working together, because they agree with each other
  3. 3(music) if singers or musicians sing or play in unison, they sing or play notes at the same pitch or at one or more octaves apart

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