Webster's English Dictionary

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trio

trio \'tre--(.)o-\ n [F, fr. It, fr. tri- (fr. L)] 1a: a musical 
   composition for three voice parts or three instruments  1b: the secondary 
   or episodic division of a minuet or scherzo, a march, or  of various dance 
   forms 2: the performers of a musical or dance trio  3: a group or set of 
   three