From Middle English trinite, from Anglo-Norman trinite (or Old French ternite, trenite, trinitet), from Latin trīnitātem, accusative singular of trīnitās, from trīni (from trīnus, from trēs, from Proto-Italic *trēs, from Proto-Indo-European *tréyes ("three")) + -itās (from Proto-Italic *-itāts and *-otāts, from Proto-Indo-European *-teh₂ts ("''suffix forming nouns indicating a [[state#Noun")).
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