Webster's English Dictionary

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trinity

Trin.i.ty \'trin-*t-e-\ n [ME trinite, fr. OF trinite`, fr. LL trinitat-, 
   trinitas)X state of being threefold, fr. L trinus trine 1: the unity of 
   Father, Son, and Holy Spirit as three persons in one godhea d not cap  2: 
   any union of three in one : TRIAD  3: the Sunday after Whitsunday observed 
   as a feast in honor of the Trinity