joker - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “joker”

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joker

noun [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)
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