Definition of unisons:
(n) :
(British, labor union) A public-sector trade union in the United Kingdom.
(n) :
The state of being in harmony or agreement; harmonious agreement or togetherness, synchronisation.
(n) :
(music, acoustics) Identical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves).
(n) :
(by extension) Two or more voices speaking or singing the same words together.
(n) :
(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.
(n) :
Alternative letter-case form of UNISON (“British trade union for public-sector workers”). [(British, labor union) A public-sector trade union in the United Kingdom.]