bet

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An agreement usually between two parties that the one who has made an incorrect prediction about an uncertain outcome will forfeit something stipulated to the other; a wager.
2. n. An amount or object risked in a wager; a stake.
3. n. One on which a stake is or can be placed: Our team is a sure bet to win.
4. n. A plan or an option considered with regard to its probable consequence: Your best bet is to make reservations ahead of time.
5. n. Informal A view or opinion, especially about something that cannot be known at the present time: My bet is that the rain will hold off. My bet is he didn't do it.
6. v. To stake (an amount, for example) in a bet.
7. v. To make a bet with: I bet them that we would be first.
8. v. To make a bet on (a contestant or an outcome).
9. v. To maintain confidently, as if making a bet: I bet they were surprised by the news.
10. v. To make or place a bet.
11. idiom. you bet Informal Of course; surely.

Century Dictionary and Cyclopedia

1. Obsolete and earlier Middle English form of better.
2. To pledge as a forfeit to another who makes a similar pledge in return, on a future contingency, in support of an affirmation or opinion; stake; wager.
3. To lay a wager; stake money or anything of value upon a contingency.
4. n. The pledging of some valuable thing, as money (or of the doing of some onerous act), to bc forfeited, in ease some future event happens contrary to the assertion or belief of the one making the pledge, to another who pledges a forfeit in return on the opposite contingency.
5. n. That which is wagered; also, that about which a wager is made.
6. n. An obsolete preterit of beat.
7. n. In faro, a card which is a case, that is, the only one of that denomination remaining in the box: so called because the player cannot be split.

Wiktionary

1. n. A wager, an agreement between two parties that a stake (usually money) will be paid by the loser to the winner (the winner being the one who correctly forecast the outcome of an event).
2. n. A degree of certainty.
3. v. To agree that payment be made to the successful forecaster of the result of an event (usually sporting) by the other party in the agreement. To make a guess about the outcome of an event.
4. v. To be sure of something; to be able to count on something.
5. v. poker To place money into the pot in order to require others do the same, usually only used for the first person to place money in the pot on each round.
6. n. Alternative form of beth.
7. abbr. knitting between

GNU Webster's 1913

1. n. That which is laid, staked, or pledged, as between two parties, upon the event of a contest or any contingent issue; the act of giving such a pledge; a wager.
2. v. To stake or pledge upon the event of a contingent issue; to wager.
3. obsolete imp. & p. p. of beat.
4. obsolete An early form of better.

WordNet 3.0

1. v. stake on the outcome of an issue
2. n. the money risked on a gamble
3. n. the act of gambling
4. v. maintain with or as if with a bet
5. v. have faith or confidence in