GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Jackpot (?), n.
   1. Same as jack pot.  See under jack.
   
   [PJC]
   
   
   2. Any larger-than-usual gambling prize formed by the accumulation of unwon bets.
   
   [PJC]
   
   
   3. The highest gambling prize awarded in a gambling game in which smaller prizes are also awarded, especially such a prize on a slot machine.
   
   [PJC]
   
   
   4. An unusually large success in an enterprise, either unexpected or unpredictable, esp. one providing a great financial benefit.
   
   [PJC]
   
   hit the jackpot to receive an unexpectedly large (or the largest possible) benefit from an enterprise; as, “after prospecting for years, he finally hit the jackpot when he discovered a silver lode”.
   
   [PJC]