mis·ceg·e·na·tion (mĭ-sěj'ə-nā'shən, 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 Indo-European roots + genus, race; see genə- in Indo-European roots + -ation.] mis·ceg'e·na'tion·al adj.