TRIO

trio. Trio, n. a concert of three parts, three

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Tri″o (?), n. [[It., fr. L. tres, tria, three: cf. F. trio, from the Italian. See Three.]] 1. 1. Three, considered collectively; three in company or acting together; a set of three; three united.
The trio were well accustomed to act together, and were linked to each other by ties of mutual interest. Dickens. 2. 2. (Mus.) (a) A composition for three parts or three instruments. (b) The secondary, or episodical, movement of a minuet or scherzo, as in a sonata or symphony, or of a march, or of various dance forms; — not limited to three parts or instruments.