GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Joker (?), n.
   1. One who makes jokes or jests.
   
   [1913 Webster]
   
   
   2. (Card Playing) See Best bower, under 2d Bower.
   
   [1913 Webster]
   
   
   3. (Card Playing) An extra card usually included in a deck of playing cards, having the same design as the others on the back, but on the face having a picture of a jester.  It is not included in the deck used in most games, but in certain games may be included and then takes on a special value, such as the highest-valued card, or a wild card.
   
   [PJC]
   
   
   4. A clause placed in a document, such as a contract or a piece of legislation, not itself appearing significant, but in a subtle way substantially changing the effect of the document.
   
   [PJC]
   
   
   5. Hence: Any fact or condition which is unknown or not apparent, which reverses an apparently advantageous position; a kicker.
   
   [PJC]
   
   
   6. A person; a fellow; a chap; -- usually used in a mildly disparaging sense; as, “who's the joker who left the ice cream on the table?”.
   
   [PJC]