Definition of unison noun from the Oxford Advanced American Dictionary

 

unison

 noun
noun
NAmE//ˈyunəsn//
 
 
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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