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trination

[trahy-ney-shuh n]
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noun
  1. celebration of Mass three times on the same day by the same priest.
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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. 2018