Incest Definition

Sexual relations between persons who are so closely related that their marriage is illegal or forbidden by custom.
American Heritage
Sexual intercourse between persons too closely related to marry legally.
Webster's New World
Sexual molestation of a child or adolescent by a relative, esp. by a parent or other adult relative.
Webster's New World

Sexual relations between close relatives, usually considered taboo; in many jurisdictions, close relatives are not allowed to marry, and incest is a crime.

Genetic problems caused by incest are thought to have plagued many royal families in the Middle Ages.

Origin of Incest

  • Middle English from Latin incestum from neuter of incestus impure, unchaste in- not in–1 castus pure, chaste kes- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin incestus.

    From Wiktionary

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