To add further: This is from the Oxford. I have bolded some parts:
Each of the major divisions of humankind, having distinct physical characteristics:
people of all races, colours, and creeds
[MASS NOUN] The fact or condition of belonging to a racial division
or group; the qualities or characteristics associated with this.
EXAMPLE SENTENCES
1.2A
group of people sharing the same culture, history, language, etc.; an ethnic group:
we Scots were a bloodthirsty race then
MORE EXAMPLE SENTENCES
SYNONYMS
1.3A group or set of people or things with a common feature or features:
some male firefighters still regarded women as a race apart
MORE EXAMPLE SENTENCES
SYNONYMS
1.4 Biology A population within a species that is distinct in some way, especially a subspecies:
people have killed so many tigers that two races are probably extinct
MORE EXAMPLE SENTENCES
1.5(In non-technical use) each of the major divisions of living creatures:
a member of the human race
the race of birds
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1.6 literary A group of people descended from a common ancestor:
a prince of the race of Solomon
MORE EXAMPLE SENTENCES
SYNONYMS
1.7 [MASS NOUN] archaic Ancestry:
two coursers of ethereal race
Although ideas of race are centuries old, it was not until the 19th century that attempts to systematize racial divisions were made. Ideas of supposed racial superiority and social Darwinism reached their culmination in Nazi ideology of the 1930s and gave pseudoscientific justification to policies and attitudes of discrimination, exploitation, slavery, and extermination. Theories of race asserting a link between racial type and intelligence are now discredited. Scientifically it is accepted as obvious that there are subdivisions of the human species, but it is also clear that genetic variation between individuals of the same race can be as great as that between members of different races
Usage
In recent years, the associations of race with the ideologies and theories that grew out of the work of 19th-century anthropologists and physiologists has led to the use of the word race itself becoming problematic. Although still used in general contexts, it is now often replaced by other words which are less emotionally charged, such as people(s) or community.
(
http://www.oxforddictionaries.com/definition/english/race#race-2 )