consisting of three parts, or proceeding by three; ternary.

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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trinary (ˈtraɪnərɪ)
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]

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Example sentences for trinary
The plan had a new road design to minimise traffic the trinary road system.
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