(acoustics) Identical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves). Example: The unison has a pitch ratio of 1:1.
(acoustics) A sound or note having the same pitch as another, especially when used as the base note for an interval; a unison string.
The state of being in harmony or agreement; harmonious agreement or togetherness, synchronisation. Example: Everyone moved in unison, but the sudden change in weight distribution capsized the boat.
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