1.One who makes jokes or jests.
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.
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.
5.Hence: Any fact or condition which is unknown or not apparent, which reverses an apparently advantageous position; a kicker.
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?.
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