n. pl. tri·os 1. Music a. A composition for three voices or three instruments. b. A group of three singers or three instrumentalists. c. The middle, contrasting section of a minuet, scherzo, march, or various other forms. 2. A group of three. [French, composition for three voices, from Italian : tri-, three (from Latin; see trei- in the Appendix of Indo-European roots) + (du)o, duet; see DUO.] |
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