To have property or a right taken away, usually as a result of a breach of contract or violation of law. For example, driving while intoxicated may result in the driver being required to forfeit his license for six months. To lose an estate, a franchise, or other property belonging to one, by the act of the law, and as a consequence of some misfeasance, negligence, or omission. The further ideas connoted by this term are that it is a deprivation, (that is, against the will of the losing party,) and that the property is either transferred to another or resumed by the original grantor. To incur a penalty; to become liable to the payment of a sum of money, as the consequence of a certain act.
FORFEIT
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.