Definition of jackpots:
(n) :
A money prize pool which accumulates until the conditions are met for it to be won.
(n) :
A large cash prize or money.
(n) :
An unexpected windfall or reward.
(n) :
(pinball) A large accumulated point bonus, originally awarded after a long set of actions but now often easily available in multiball modes.
(v) :
(intransitive) Of a slot machine, to issue a jackpot.
(v) :
(transitive, crime, uncommon) To fraudulently exploit an automatic teller machine so that it dispenses cash that has not been withdrawn from an account.