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usually uncountable, plural unisons
(music, acoustics) Identical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves). quotations examples
The young principal timpanist, Timothy Genis, was superb throughout, though his sidekick timpanist sometimes lagged in the final unisons.
2007 July 16, James R. Oestreich, “With Levine as Tour Guide, a Journey Through Mahler’s Third Symphony”, in New York Times
(music, acoustics) A sound or note having the same pitch as another, especially when used as the base note for an interval; a unison string. quotations examples
I could not behold him without emotion; when he accosted me, his well-known voice made my heart vibrate, like a musical chord, when its unison is struck.
1751, [Tobias] Smollett, The Adventures of Peregrine Pickle […], volumes (please specify |volume=I to IV), London: Harrison and Co., […]
The state of being in harmony or agreement; harmonious agreement or togetherness, synchronisation. examples
(by extension) Two or more voices speaking or singing the same words together. examples