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Webster 1913 Edition

Noun.

Connection by marriage; reciprocal marriage; giving and taking in marriage, as between two families, tribes, races, castes, or nations.

Noun.

[inter and marriage.] Marriage between two families, where each takes one and gives another.

intermarriage ‎(countable and uncountable, plural intermarriages)

Marriage between people belonging to different groups, such as different racial, ethnic, or religious groups; mixed marriage.
During the 1960s, some Georgians opposed the intermarriage of blacks and whites.

mixed marriage — see mixed marriage