Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Latin
Origin: incestum, from castus 'pure'; CHASTE

incest

 noun
     
in‧cest [uncountable]
sex between people who are closely related in a family:
Abortions would only be allowed in cases of rape or incest.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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