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incest n

[Latin incestus sexual impurity, from incestus impure, from in- not + castus pure]
: sexual intercourse between persons so closely related that they are forbidden by law to marry
: the crime of engaging in such sexual intercourse

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.