| 1. | any aspect of human existence that must be acknowledged or regarded as unalterable: Old age is a fact of life. |
| 2. | facts of life, the facts concerning sex, reproduction, and birth: to teach children the facts of life. |

| fact of life n. pl. facts of life
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facts of life
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facts of life pl.n.
The basic physiological functions involved in sex and reproduction. Often used with the.
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.