Definitions of race:

• noun:   a contest of speed

  Example: "The race is to the swift"

• noun:   any competition

  Example: "The race for the presidency"

• noun:   people who are believed to belong to the same genetic stock

  Example: "Some biologists doubt that there are important genetic differences between races of human beings"

• noun:   a canal for a current of water
• noun:   (biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species
• noun:   the flow of air that is driven backwards by an aircraft propeller
• verb:   cause to move fast or to rush or race

  Example: "The psychologist raced the rats through a long maze"

• verb:   to work as fast as possible towards a goal, sometimes in competition with others
• verb:   compete in a race

  Example: "Let's race and see who gets there first"

• verb:   step on it

  Example: "The cars raced down the street"

• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #4921)