noun, plural alibis.
Law. the defense by an accused person of having been elsewhere at the time an alleged offense was committed.
an excuse, especially to avoid blame.
a person used as one's excuse: My sick grandmother was my alibi for missing school.
verb (used without object)
Informal. to give an excuse; offer a defense: to alibi for being late.
verb (used with object)
to provide an alibi for (someone): He alibied his friend out of a fix.
to make or find (one's way) by using alibis: to alibi one's way out of work.

1720–30; < Latin alibī (adv.): in or at another place

alibi, excuse (see usage note at the current entry)(see synonym study at excuse).

2. explanation, reason, justification.

Alibi in Latin is an adverb meaning “in or at another place.” Its earliest English uses, in the 18th century, are in legal contexts, both as an adverb and as a noun meaning “a plea of having been elsewhere.” The extended noun senses “excuse” and “person used as one's excuse” developed in the 20th century in the United States and occur in all but the most formal writing. As a verb alibi occurs mainly in informal use. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alibi (ˈælɪˌbaɪ)
n , pl -bis
1.  law
 a.  a defence by an accused person that he was elsewhere at the time the crime in question was committed
 b.  the evidence given to prove this
2.  informal an excuse
3.  (tr) to provide with an alibi
[C18: from Latin alibī elsewhere, from alius other + -bī as in ubī where]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1743, "the plea of having been elsewhere when an action took place," from L. alibi "elsewhere," locative of alius "(an)other" (see alias). The weakened sense of "excuse" is attested since 1912, but technically any proof of innocence that doesn't involve being "elsewhere" is an excuse, not an alibi.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But intrusion allowed only when it is in the public interest-no other alibis
Fake clocks drive their narrative worlds: countdowns and alibis, crime scenes.
Other investigators can check alibis by comparing stories a suspect tells
  police with their tweets sent at the same time.
His plan is to bring them happiness by ridding them of their existential alibis
  and making them face who and what they are.
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