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1. In exact agreement or harmony. The board voted in unison to approve the development.
2. At the exact same time; simultaneously. We recited the poem in unison, in one unified voice. For this play to work, you all have to move 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.
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.
in unison (with somebody/something)
1 if people do or say something in unison, they all do it at the same time: ‘Good morning, Mrs Crawford’ the children shouted in unison.
2 if people or organizations are working in unison, they are working together, because they agree with each other: I am pleased to report that the various committees are now working in unison to thoroughly investigate this matter.