trio Definition

trio
noun trios

1. A group or set of three.

Thesaurus: threesome, trinity, triad, triplet, triptych.
2a. music.
A group of three instruments, players or singers;
2b. music.
A piece of music composed for such a group.
3. music.
A contrastive central section of a minuet, scherzo or march.

Etymology: 18c: French, from Italian tre three, influenced by duo.