Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Sexual relations between persons who are so closely related that their marriage is illegal or forbidden by custom.
  • n. The statutory crime of sexual relations with such a near relative.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Sexual relations between close relatives (too closely related to be legally married), usually considered taboo, and a crime in many jurisdictions.

from the GNU version of the Collaborative International Dictionary of English

  • n. The crime of cohabitation or sexual intercourse between persons related within the degrees wherein marriage is prohibited by law

from The Century Dictionary and Cyclopedia

  • n. The offense of cohabitation or sexual commerce between persons related within the degrees wherein marriage is prohibited by the law or established usage of a country. In this offense illegitimate consanguinity is of the same effect as legitimate.
  • n. The holding, by a vicar or other beneficiary, of two benefices, one of which depends upon the collation of the other.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. sexual intercourse between persons too closely related to marry (as between a parent and a child)

Etymologies

Middle English, from Latin incestum, from neuter of incestus, impure, unchaste : in-, not; see in-1 + castus, pure, chaste; see kes- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin incestus. (Wiktionary)

Examples

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