trination [trahy-ney-shuh n] WORD ORIGIN noun celebration of Mass three times on the same day by the same priest. Liberaldictionary.com
Origin of trination New Latin trīnāt(us) (past participle of trīnāre to triple, perhaps derivative of Latin trīnī by threes) + -ion Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019