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Consisting of three parts or proceeding by threes; ternary.
[Late Latin trīnārius, from Latin trīnus, trine; see trine.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. made up of three parts; ternary
2. going in threes
[C15: from Late Latin trīnārius of three sorts, from Latin trīnī three each, from trēs three]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
tri•na•ry(ˈtraɪ nə ri)
consisting of three parts, or proceeding by three; ternary.
[1425–75; late Middle English < Late Latin trīnārius of three kinds = Latin trīn(ī) by threes (alter. of ternī, derivative of ter thrice (see ter-) on the model of bīnī by twos) + -ārius -ary]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Trinarya set of three.
Example: trinary of peers, 1654.
Dictionary of Collective Nouns and Group Terms. Copyright 2008 The Gale Group, Inc. All rights reserved.