Ĭn'cest, n.

n. [Fr. inceste, It. & Sp. incesto, from Lat. incestum, unchastity, incest, from incestus, unchaste, from prefix in, not, and castus, chaste.] The crime of cohabitation or sexual commerce between persons related within the degrees wherein marriage is prohibited.

Spiritual incest. (a.) The crime of cohabitation committed between persons who have a spiritual alliance by means of baptism or confirmation. (b.) The act of a vicar, or other beneficiary, who holds two benefices, the one depending on the collation of the other.