Pronunciation: ( jak'pot"),[key] —n. 1. the chief prize or the cumulative stakes in a game or contest, as in bingo, a quiz contest, or a slot machine.
2. Poker.a pot that accumulates until a player opens the betting with a pair of predetermined denomination, usually jacks or better.
3. an outstanding reward or success.
4. hit the jackpot,Informal. a. to achieve a sensational success; have sudden luck: The firm has hit the jackpot with its new line of computers. b. to win a jackpot.