Noah Webster's New International Dictionary of the English Language
1. (v.) To surrender possession due to error or misdeed; as, to forfeit property; to forfeit a game.
2. (n.) A thing forfeit or forfeited; what is or may be taken from one in requital of a misdeed committed; that which is lost, or the right to which is alienated, by a crime, offense, neglect of duty, or breach of contract; hence, a fine; a mulct; a penalty; as, he who murders pays the forfeit of his life.
3. (n.) Something deposited and redeemable by a sportive fine; -- whence the game of forfeits.
4. (n.) Lost or alienated for an offense or crime; liable to penal seizure.
5. (n.) To lose, or lose the right to, by some error, fault, offense, or crime; to render one's self by misdeed liable to be deprived of; to alienate the right to possess, by some neglect or crime; as, to forfeit an estate by treason; to forfeit reputation by a breach of promise; -- with to before the one acquiring what is forfeited.
6. (v. i.) To be guilty of a misdeed; to be criminal; to transgress.
7. (v. i.) To fail to keep an obligation.
8. (p. p. / a.) In the condition of being forfeited; subject to alienation.