Etymology
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trine (adj.)

"threefold," late 14c., from Old French trine "triple, threefold" (13c.), from Latin trinus "threefold," from tres "three" (see three).

updated on February 16, 2014

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Definitions of trine from WordNet

trine (n.)
the cardinal number that is the sum of one and one and one;
Synonyms: three / " / iii / trio / threesome / tierce / leash / troika / triad / trinity / ternary / ternion / triplet / tercet / terzetto / trey / deuce-ace
From wordnet.princeton.edu, not affiliated with etymonline.