[ tree-oh ]
/ ˈtri oʊ /

noun, plural tri·os.

a musical composition for three voices or instruments.
a company of three singers or players.
any group of three persons or things.
a subordinate division of a minuet, scherzo, march, etc., usually in a contrasted key and style (perhaps originally written for three instruments or in three parts).

Origin of trio

1715–25; < Italian, equivalent to tri- tri- + (du)o two Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for trio

British Dictionary definitions for trio

/ (ˈtriːəʊ) /

noun plural trios

a group of three people or things
  1. a group of three singers or instrumentalists or a piece of music composed for such a group
  2. a subordinate section in a scherzo, minuet, etc, that is contrastive in style and often in a related key
piquet three cards of the same rank

Word Origin for trio

C18: from Italian, ultimately from Latin trēs three; compare duo
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012