D defs.my
Entry 1 sense Webster, 1913

Incest

/ĭn'-sĕstˌ/ · In·cest · IPA /ˈɪn.sɛst/
01 n. The crime of cohabitation or sexual intercourse between persons related within the degrees wherein marriage is prohibited by law;
  1. 1.
    The crime of cohabitation or sexual intercourse between persons related within the degrees wherein marriage is prohibited by law;
Phrases & compounds
Spiritual incest — The crime of cohabitation committed between persons who have a spiritual alliance by means of baptism or confirmation.