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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
[of musical notes, instruments, or voices] having the same pitch. This part of the piece is performed in unison. The twins sang in unison.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
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