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English definition of “unison”

unison

noun uk   /ˈjuː.nɪ.sən/ us  

unison noun (SINGING TOGETHER)

[U or C] the playing or singing of notes at the same pitch by different instruments or voices: unison singing Here the tenors are in unison with the basses.

unison noun (ACTING TOGETHER)

in unison acting or speaking together, or at the same time: "We want ice cream!" the children chanted in unison.Acting, being or existing together
(Definition of unison from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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