Dictionary.net

occurring together or simultaneously; "the two spoke in unison"

occurring together or simultaneously; "the two spoke in unison"

Harmony; agreement; concord; union.

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.

A single, unvaried.

Sounding alone.

Sounded alike in pitch; unisonant; unisonous; as, unison passages, in which two or more parts unite in coincident sound.

Harmony; agreement; concord; union.

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.

A single, unvaried.

Sounding alone.

Sounded alike in pitch; unisonant; unisonous; as, unison passages, in which two or more parts unite in coincident sound.

Sounding alone.

Oneness; agreement; concord; in music, sameness of pitch; the rendering of the same series of tones by all the voice parts at once: opposite to harmony.

Oneness or agreement of sound: concord: harmony.

Oneness or identity of sound; concord; harmony; in mus., two or more parts having the same note.

A condition of perfect accord; harmony.

Coincidence of sounds.

Sounding alone; agreeing in pitch. In unison, in harmony.

An accordance or coincidence of sounds, proceeding from an equality in the number of vibrations made in a given time by a sonorous body; a single unvaried note; accordance; agreement.

n. [Latin] Harmony; agreement; concord; union; --an accordance or coincidence of sounds preceding from an equality in the number of vibrations made in a given time by a sonorous body.