Real Dictionary

race
countable noun: A race is a competition to see who is the fastest, for example in running, swimming, or driving.

race in American English 1
a competition of speed in running, skating, riding, etc.
noun: a contest of speed, as in running, riding, driving, or sailing

race in American English 2
any of the different varieties or populations of human beings distinguished by a) physical traits such as hair, eyes, skin color, body shape, etc.: traditionally, the three primary divisions are Caucasoid, Negroid, and Mongoloid, although many subdivision
adjective: of or pertaining to the races of humankind
noun: a group of persons related by common descent or heredity

race in American English 3
noun: a ginger root

Race in British English
noun

race in British English 1
noun: a contest of speed, as in running, swimming, driving, riding, etc

race in British English 2
noun: a group of people of common ancestry, distinguished from others by physical characteristics, such as hair type, colour of eyes and skin, stature, etc

race in British English 3
noun: a ginger root