(1) A group or population of humans categorized on the basis of various sets of heritable characteristics (such as color of skin, eyes, and hair).
(6) (zoology) A breed or strain of domesticated animal.
(7) (sports) The act of running, especially in competition or contest of speed.
(8) (geology ) A strong or rapid current of water.
Humans have been categorized into many distinct varieties or races. One of the most common (and an old) subcategorization of human species is the five human races by Blumenbach: the Caucasian (white race), Mongolian (yellow race), Ethiopian (negro race), American (red race), and the Malayan (brown race). At present, such classification is disputed to have no biological validity. The biological context of the term race is only widely accepted when used to refer to a subspecies arising from a partially isolated reproductive population and thus share a considerable degree of genetic similarity. An example is the African wildcat, which is a subspecies of the domesticated cat.