Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: 'somewhere else'

alibi

 noun
     
al‧i‧bi [countable]
1 something that proves that someone was not where a crime happened and therefore could not have done it
a perfect/cast-iron/unshakeable etc alibi
He had a perfect alibi and the police let him go.
2 an excuse for something you have failed to do or have done wrong
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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