What is it called when two people of different races are in a relationship?

Interracial marriage is a form of marriage involving spouses who belong to different races or racialized ethnicities.

What does two or more races mean?

The term “Two or more races” refers to people who chose more than one of the six race categories. These individuals are referred to as the Two or more races pop- ulation, or as the population that reported more than one race. Data on race has been collected since the first U.S. decennial census in 1790.