unison

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unison,

in music, tones identical in pitch produced by two or more parts or voices. In popular usage a vocal composition is said to be sung in unison even though some of the voices are separated from others by the interval of an octave.
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unison

Music
a. the interval between two sounds of identical pitch
b. played or sung at the same pitch
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005