trinary

[trahy-nuh-ree] /ˈtraɪ nə ri/
adjective
1.
consisting of three parts, or proceeding by three; ternary.
Origin
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
Examples from the web for trinary
  • The plan had a new road design to minimise traffic the trinary road system.
British Dictionary definitions for trinary

trinary

/ˈtraɪnərɪ/
adjective
1.
made up of three parts; ternary
2.
going in threes
Word Origin
C15: from Late Latin trīnārius of three sorts, from Latin trīnī three each, from trēs three