joker

[joh-ker]
noun
1.
a person who jokes.
2.
one of two extra playing cards in a pack, usually imprinted with the figure of a jester, used in some games as the highest card or as a wild card.
3.
U.S. politics. a clause or expression inserted in a legislative bill with the unavowed object of defeating the ostensible purpose of the bill if passed.
4.
a seemingly minor, unsuspected clause or wording that is put into an agreement, legal document, etc., to change its effect.
5.
an unexpected or final fact, factor, or condition that changes or reverses a situation or result completely: He gave her a beautiful diamond engagement ring, but the joker was that it was stolen!
6.
any method, trick, or expedient for getting the better of another: They pulled a joker on us to get better seats.
7.
Informal. a man; fellow; chap: That joker is earning twice as much as I am.
8.
a person who thinks he or she is very funny; prankster: Who's the joker who frosted the cake with shaving cream?
9.
Informal. a wise guy; wiseacre; smart aleck: Tell that joker to stop using my parking space.

Origin:
1720–30; joke + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
joker (ˈdʒəʊkə)
 
n
1.  a person who jokes, esp in an obnoxious manner
2.  slang, derogatory often a person: who does that joker think he is?
3.  an extra playing card in a pack, which in many card games can substitute for or rank above any other card
4.  chiefly (US) a clause or phrase inserted in a legislative bill in order to make the bill inoperative or to alter its apparent effect

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
And the only thing lacking in this big drama was a joker and last years election has provided us with one.
Whether a joker is behind the whole thing or not is of little relevance since it is outside my frame of reference.
He has a tattoo of a joker with an eight ball on his left upper arm and a dragon on his right upper arm.
Joker dealt up is considered an ace for opening betting and may be used to complete a straight or flush.
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