uni·​so·​no | \¦ünē¦sō(ˌ)nō\

Definition of unisono 

: perform in unison or octaves used as a direction in ensemble music

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First Known Use of unisono

1854, in the meaning defined above

History and Etymology for unisono

Italian, from Medieval Latin unisonus

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The first known use of unisono was in 1854

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