jackpot

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The accumulated stakes in a kind of poker that requires one to hold a pair of jacks or better in order to open the betting.
• noun The largest prize or reward in various games or contests.
• noun A lucky development or substantial success.

from The Century Dictionary.

• noun In lumbering, an unskilful piece of work.
• noun A pile of logs.
• noun In draw-poker, a pot or pool in which the ante must be repeated until some player can open the betting with a pair of jacks or better.

from the GNU version of the Collaborative International Dictionary of English.

• noun Same as jack pot. See under jack.
• noun Any larger-than-usual gambling prize formed by the accumulation of unwon bets.
• noun The highest gambling prize awarded in a gambling game in which smaller prizes are also awarded, especially such a prize on a slot machine.
• noun An unusually large success in an enterprise, either unexpected or unpredictable, esp. one providing a great financial benefit.
• noun to receive an unexpectedly large (or the largest possible) benefit from an enterprise.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A money prize pool which accumulates until the conditions are met for it to be won.
• noun A large cash prize or money.
• noun An unexpected windfall or reward.
• noun Western US A difficult situation.
• noun A jumble of felled timber.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any outstanding award
• noun the cumulative amount involved in a game (such as poker)