Etymology
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alibi (n.)

1743, "a plea of having been elsewhere when an action took place," from Latin alibi (adv.) "elsewhere, somewhere else," locative of alius "another, other, different," from PIE root *al- (1) "beyond." The weakened sense of "excuse" is attested since 1912, but technically any proof of innocence that doesn't involve being "elsewhere" is an excuse (n.) and not an alibi.

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Definitions of alibi
1
alibi (n.)
(law) a defense by an accused person purporting to show that he or she could not have committed the crime in question;
alibi (n.)
a defense of some offensive behavior or some failure to keep a promise etc.;
every day he had a new alibi for not getting a job
2
alibi (v.)
exonerate by means of an alibi;
From wordnet.princeton.edu