term:

Alibi

alibi n

[Latin, elsewhere, from alius other]
: a defense of having been somewhere other than at the scene of a crime at the time the crime was committed
;also
: the fact or state of having been elsewhere at the time a crime was committed NOTE: Federal Rule of Criminal Procedure 12.1 requires the defendant to provide notice upon written demand of an intention to offer a defense of alibi. Likewise, the prosecution must provide to the defendant upon written demand the names of witnesses that will be used to rebut the defense.

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.