1a. One who tells or plays jokes. b. An insolent person who seeks to make a show of cleverness. c.Informal A person, especially an annoying or inept one: Some joker is blocking my driveway.2.Games A playing card, usually printed with a picture of a jester, used in certain games as the highest-ranking card or as a wild card. 3. A minor clause in a document such as a legislative bill that voids or changes its original or intended purpose. 4. An unforeseen but important difficulty, fact, or circumstance. 5. A deceptive means of getting the better of someone.
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