noun, plural trios.
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).

1715–25; < Italian, equivalent to tri- tri- + (du)o two Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trio (ˈtriːəʊ)
n , pl trios
1.  a group of three people or things
2.  music
 a.  a group of three singers or instrumentalists or a piece of music composed for such a group
 b.  a subordinate section in a scherzo, minuet, etc, that is contrastive in style and often in a related key
3.  piquet three cards of the same rank
[C18: from Italian, ultimately from Latin trēs three; compare duo]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1724, from Fr. trio (c.1600), from It. trio, from tri- "three;" patterned on duo.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
Transplant Recipients International Organization
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


a musical composition for three instruments or voices, or a group of three performers.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Faithful companions who help us find our way in the world-and into a trio of
  happy endings.
Examination under a high-powered microscope revealed a trio of narrow grooves
  cut into the fragile wax.
It's of course worth mentioning that any errors there are my own rather than
  those of the fabulous trio of workshop leaders.
But a trio of scientists has created a set of tools that might help scholars
  find their way around.
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