Unison /(?; 277)/

U·ni·son

Unison

n.
  1. Harmony; agreement; concord; union.
  2. 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. (Mus.)
  3. A single, unvaried. [R.]

Phrases & Compounds
In unison
in agreement; agreeing in tone; in concord.

Unison

a.
  1. Sounding alone. [Obs.]
    [sounds] intermixed with voice, Choral or unison.
  2. Sounded alike in pitch; unisonant; unisonous; as, unison passages, in which two or more parts unite in coincident sound. (Mus.)