(music) being in unison

(Britain, labor union) A public-sector trade union in the United Kingdom.

(music, acoustics) Identical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves).

plural of unison

Of a single sound; producing the same sound.

Being in unison; unisonant.

Accordance of sounds; unison.

moving or acting all at the same time

(music) In unison.

(music) an interval that is equivalent to a half step