mis·ceg·e·na·tion 
(mĭ-sĕj′ə-nāshən, mĭs′ĭ-jə-)
(mĭ-sĕj′ə-nāshən, mĭs′ĭ-jə-)n.
Cohabitation, sexual relations, marriage, or interbreeding involving persons of different races, especially in historical contexts as a transgression of the law.
[Latin miscēre, to mix; see meik- in the Appendix of Indo-European roots + genus, race; see genə- in the Appendix of Indo-European roots + -ATION.]
mis·ceg′e·nation·al adj.