unison

UK: 'Unison', 'unison': /ˈjuːnɪsən/

US: /ˈjunəsən, -zən/

US: (yo̅o̅′nə sən, -zən)

WordReference Random House Learner's Dictionary of American English © 2025

u•ni•son /ˈyunəsən, -zən/   n. [uncountable]

1. Music and Dance the state of two or more musical tones, voices, etc., being at the same pitch or note.

Idioms

2. Idioms in unison:
   • in perfect agreement or accord:
     My feelings are in unison with yours.
   • at the same time and in the same way:
     to march in unison.

See -uni-, -son-.

WordReference Random House Unabridged Dictionary of American English © 2025

u•ni•son  (yo̅o̅′nə sən, -zən), n. 

1. Music and Dance coincidence in pitch of two or more musical tones, voices, etc.
2. Music and Dance the musical interval of a perfect prime.
3. Music and Dance the performance of musical parts at the same pitch or at the octave.
4. Music and Dance a sounding together in octaves, esp. of male and female voices or of higher and lower instruments of the same class.
5. a process in which all elements behave in the same way at the same time;
   simultaneous or synchronous parallel action:
   to march in unison.
6. in unison, in perfect accord;
   corresponding exactly:
   My feelings on the subject are in unison with yours.

• Medieval Latin ūnisonus of a single sound, equivalent. to Latin ūni- uni- + sonus sound
• 1565–75

Collins Concise English Dictionary © HarperCollins Publishers::

unison / ˈjuːnɪs^ən -z^ən/ noun

1. the interval between two sounds of identical pitch
2. (modifier) played or sung at the same pitch: unison singing
3. complete agreement; harmony (esp in the phrase in unison)

Etymology: 16th Century: from Late Latin ūnisonus, from uni- + sonus sound

uˈnisonous, uˈnisonal, uˈnisonant adjective

Collins Concise English Dictionary © HarperCollins Publishers::

UNISON / ˈjuːnɪs^ən/ noun

1. (in Britain) a trade union representing local government, health care, and other workers: formed in 1993 by the amalgamation of COHSE, NALGO, and NUPE