Meaning of “posterior” in the English Dictionary

"posterior" in British English

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

"posterior" in American English

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posteriornoun [ C ]

us /pɑˈstɪər·i·ər, poʊ-/ infml usually humorous

a person’s buttocks:

Park your posterior on that seat.

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