WordReference Random House Unabridged Dictionary of American English © 2026
tri•na•tion
(trī nā′shən),USA pronunciation n.
- Religioncelebration of Mass three times on the same day by the same priest.
- Neo-Latin trīnāt(us) (past participle of trīnāre to triple, perh. derivative of Latin trīnī by threes) + -ion