Definitions for fact of life
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Random House Webster's College Dictionary
fact′ of life′(n.)
any aspect of human existence that must be acknowledged or regarded as unalterable.
Idioms for fact of life:
facts of life,the facts concerning sex, reproduction, and birth.
Category: Idiom
Origin of fact of life:
1850–55
Wiktionary
fact of life(Noun)
Something that cannot be avoided.
Citation
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"fact of life." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/fact of life>.