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in unison
in unison
[of musical notes, instruments, or voices] having the same pitch. This part of the piece is performed in unison. The twins sang in unison.
in unison
together at the same time The audience rose to its feet in unison, applauding and cheering. All the babies in the nursery were wailing in unison.
in unison
1. In complete agreement, harmonizing exactly. For example, Their opinion was in unison with ours. [Early 1800s]
2. Saying the same thing at the same time, simultaneously, as in The whole class answered in unison. [Late 1800s] Both usages allude to the unison of music, a single identical pitch.