unison

US /ˈjuː.nə.sən/
UK /ˈjuː.nə.sən/
"unison" picture
1.

simultaneous performance of action or utterance of speech

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The choir sang in unison, creating a powerful sound.
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The students answered the teacher's question in unison.
:
accordharmonyconcordagreementunity
2.

the fact of two or more musical parts sounding at the same pitch or in octaves

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The violins played the melody in unison.
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The bass and cello parts were written in unison.
:
in unison with