alibi

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Law A form of defense whereby a defendant attempts to prove that he or she was elsewhere when the crime in question was committed.
2. n. Law The fact of having been elsewhere when a crime in question was committed.
3. n. Usage Problem An explanation offered to avoid blame or justify action; an excuse.
4. v. To make an excuse for oneself.
5. v. To make an excuse for (another).

Century Dictionary and Cyclopedia

1. In law, elsewhere; at another place.
2. n. In law, a plea of having been elsewhere at the time an offense is alleged to have been committed.
3. n. The fact or state of having been elsewhere at the time specified: as, he attempted to prove an alibi.

Wiktionary

1. n. law The plea or mode of defense under which a person on trial for a crime proves or attempts to prove that he was in another place when the alleged act was committed; as, to set up an alibi; to prove an alibi
2. v. to provide an alibi for
3. v. to provide an excuse for

GNU Webster's 1913

1. n. (Law) The plea or mode of defense under which a person on trial for a crime proves or attempts to prove that he was in another place when the alleged act was committed

WordNet 3.0

1. v. exonerate by means of an alibi
2. n. (law) a defense by an accused person purporting to show that he or she could not have committed the crime in question
3. n. a defense of some offensive behavior or some failure to keep a promise etc.