race (PEOPLE)
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noun [C or U]
a group, especially of people, with particular similar physical characteristics, who are considered as belonging to the same type, or the fact of belonging to such a group:
People of many different races were living side by side.
Discrimination on grounds of race will not be tolerated.
An increasing number of people in the country are of
mixed race (= with parents of different races).
race
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group noun [C]
a group of people who share the same language, history, characteristics, etc:
LITERARY The British are an island race.
Those are the definitions of race, how can you possibly say races do not exist?