Definition of Trinity
1
: the unity of Father, Son, and Holy Spirit as three persons in one Godhead according to Christian dogma
2
not capitalized
: a group of three closely related persons or things
3
or Trinity Sunday
: the Sunday after Whitsunday observed as a feast in honor of the Trinity
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Merriam-Webster unabridged
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Time Traveler for Trinity
The first known use of Trinity was in the 13th century
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