Etymology
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triune (adj.)

"three in one," 1630s, from tri- + Latin unus "one" (from PIE root *oi-no- "one, unique"). Related: Triunity.

updated on May 17, 2017

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Definitions of triune from WordNet

triune (adj.)
being three in one; used especially of the Christian Trinity;
a triune God
From wordnet.princeton.edu, not affiliated with etymonline.