unisons

Noun

unison (usually uncountable, plural unisons)

1. (usually, acoustics) Identical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves).
   • The unison has a pitch ratio of 1:1.
2. (usually, acoustics) A sound or note having the same pitch as another, especially when used as the base note for an interval; a unison string.
   • 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 […], volume (please specify |volume=I to IV), London: Harrison and Co., […], →OCLC
3. (usually) The state of being in harmony or agreement; harmonious agreement or togetherness, synchronisation.
   • Everyone moved in unison, but the sudden change in weight distribution capsized the boat.
4. (broadly, usually) Two or more voices speaking or singing the same words together.

See all 5 meanings of unison