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  1. consisting of three parts, or proceeding by three; ternary.
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Origin of trinary

1425–75; late Middle English trynary < Late Latin trīnārius of three kinds, equivalent to Latin trīn(ī) by threes (alteration of ternī (derivative of ter thrice; see ter-) on the model of bīnī by twos; see binary) + -ārius -ary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for trinary


  1. made up of three parts; ternary
  2. going in threes
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Word Origin

C15: from Late Latin trīnārius of three sorts, from Latin trīnī three each, from trēs three
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