noun see: sound Date: 15th century 1. identity in musical pitch, the state of being so tuned or sounded, the writing, playing, or singing of parts in a musical passage at the same pitch or in octaves, a harmonious agreement or union ; concord , ~ adjective
UNISON
Meaning of UNISON in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012