(US, police, slang) Black, African-American.
He is my enemy number one.
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(idiomatic) First; foremost; best, often used after its headword.
Commuting to work is the number one reason to own a car.
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The most important person, the one who is in charge.
Djokovic came through 6-4 6-1 1-6 6-3 to end Nadal's reign as Wimbledon champion, before overtaking the Spaniard as world number one on Monday.
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