A person who makes jokes. / (slang) A funny person. / A jester. / 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.

A fictional villain of DC Comics, noted for his insanity and cunning, who either wears clown makeup or is disfigured to appear as such, and who is archenemy of Batman.

plural of joker

A higher power who is responsible for various anomalous phenomena on Earth, said manifestations being of a perverse and black-humoured nature.

plural of cosmic joker

plural of practical joker

someone who instigates practical jokes

(figuratively) Something or someone that can change things in unanticipated ways; a wildcard.

plural of video joker

(Uganda) A narrator who translates the dialogue of a film, adding their own jokes and commentary, as it is shown to an audience.