Meaning of “joker” in the English Dictionary

"joker" in British English

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

"joker" in American English

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jokernoun [ C ]

us /ˈdʒoʊ·kər/

joker noun [ C ] (PLAYING CARD)

(in some card games) a special playing card that can be given any value and used instead of any other card

joker noun [ C ] (RIDICULOUS PERSON)

an annoying person:

We had to wait for an hour because some joker lost the key.

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