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Definition number one in British English

number one

noun
1

the person or thing that is first in order or importance

Example

The team is number one in the regional game.

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2

in popular music, the record that has sold the most copies in a particular week

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3

used for talking about yourself

Example

You've got to look out for number one - no-one else will.

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4

urine. This word is used by children or when talking to children.

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5

a hairstyle for men that is slightly shorter than a number two

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Definition number one in British English