unison

Meanings

1. 1
   noun

   Complete agreement or coordinated action done together at the same time.

   The dancers moved in perfect unison across the stage.

2. 2
   noun

   Two or more voices or instruments at exactly the same pitch.

   The choir sang the final line in unison.

From Middle English unisoun, from Middle French unisson, from Medieval Latin ūnisonus (“having the same sound”), from ūni- + sonus (“sound”).

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