noun
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A person who makes jokes.
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(slang) A funny person.
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A jester.
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A playing card that features a picture of a joker (that is, a jester) and that may be used as a wild card in some card games.
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(figurative) Something kept in reserve that can be used to gain an advantage; a trump card.
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An unspecified, vaguely disreputable person.
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(New Zealand, colloquial) A man.
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A clause in a contract that undermines its apparent provisions.
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(military) A friendly unit that acts as a suspected hostile unit in a military excercise.
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The option, in a pub quiz, of selecting one particular round in which one's team will score double points.