Meaning of “trinity” in the English Dictionary

"trinity" in British English

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trinitynoun [ C usually singular ]

uk /ˈtrɪn.ə.ti/ us /ˈtrɪn.ə.t̬i/ literary

a group of three things or people:

Modern culture now appears to revolve around the unholy trinity of sport, shopping, and sex.
Above all Amenabar worships the trinity of Hitchcock, Kubrick, and Spielberg.

the Trinitynoun [ S ]

uk /ˈtrɪn.ə.ti/ us /ˈtrɪn.ə.t̬i/ also the Holy Trinity

in Christianity, the existence of one God in three forms, the Father, the Son, and the Holy Spirit

(Definition of “trinity” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"Trinity" in American English

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Trinitynoun [ U ]

us /ˈtrɪn·ɪ·t̬I/

(in many forms of Christianity) the three beings, Father, Son, and Holy Spirit, who are united as one God

(Definition of “Trinity” from the Cambridge Academic Content Dictionary © Cambridge University Press)