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| Date: | 1500-1600 |
| Language: | Old French |
| Origin: | Medieval Latin unisonus 'having the same sound', from Latin uni- + sonus 'sound' |
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u‧ni‧son
in unison
a) if people speak or do something in unison, they say the same words at the same time or do the same thing at the same time : 'Good morning!' the kids replied in unison.
'Good morning!' the kids replied in unison.b) PG if two groups, governments etc do something in unison, they do it together because they agree with each other : Management and workers must act in unison to compete with foreign business.
Management and workers must act in unison to compete with foreign business.