·noun Sounding alone.
II. Unison ·noun A single, unvaried.
III. Unison ·noun Harmony; agreement; concord; union.
IV. Unison ·noun Sounded alike in pitch; unisonant; unisonous; as, unison passages, in which two or more parts unite in coincident sound.
V. Unison ·noun Identity in pitch; coincidence of sounds proceeding from an equality in the number of vibrations made in a given time by two or more sonorous bodies. Parts played or sung in octaves are also said to be in unison, or in octaves.