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fact of life

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noun
  1. any aspect of human existence that must be acknowledged or regarded as unalterable: Old age is a fact of life.
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Idioms
  1. facts of life, the facts concerning sex, reproduction, and birth: to teach children the facts of life.
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Origin of fact of life

First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for facts of life

facts of life

pl n
  1. the facts of life the details of sexual behaviour and reproduction, esp as told to children
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

facts of life in Medicine

facts of life

(făkts)
pl.n.
  1. The basic physiological functions involved in sex and reproduction. Often used with the.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Idioms and Phrases with facts of life

facts of life

Knowledge of sexual reproduction, as in Some people feel that the facts of life should not be taught in school. [Late 1800s] Also see birds and the bees.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.