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1.
Neither 100% of this race nor 100% of that race. Basically the cause of much confusion when filling out application forms that require one to check a single box about their racial makeup.
A biracial (or multiracial) check box should be added to every application form - because this is the real world and very few people are 100% of any particular race (unless they inbreed - yuck!)
by Loxi July 20, 2009
 
2.
A person who is a genetic mix of two different races.

For more than two races see: triracial or multiracial.
Sally's mom is Asian and her dad is Hispanic, therefore she is biracial.
by whowhatnowhuh November 04, 2007
 
3.
Racial make-up consisting of a blending of two previously separate races, mainly white and black and called mulatto.
Captain Beauregard visited the slave cabins as often as possible to have sex with the slave wenches. He was the cause of all of the biracial (mulatto) children on the plantation.
by Richard Black March 20, 2005