Definition of number one in English:

number one

Line breaks: num¦ber one
informal

noun

1A person or thing that is foremost or most important in an activity or area: businesses that were number one in their markets
More example sentences
  • Being number one was more important than winning titles.
  • Through all the years performing on stage Leviev kept on repeating his motto that it is not important to be number one but to sustain your position.
  • Els remembers the difference he saw in the world number one at the 2000 Presidents Cup compared to the 1998 match in Australia.
Synonyms
primary, main, chief, key, prime, central, principal, overriding, foremost, first, most important, predominant, paramount, major, ruling, dominant, master, supreme, cardinal, pre-eminent, ultimate
informal top-notch
1.1A record or book in a particular category that has sold the most copies in a particular time period: [as modifier]: the band’s first number-one album
More example sentences
  • The final of the souped-up talent contest is on Saturday, December 17, which gives the winner four days to get a single into the shops in time to make a claim on the Christmas number-one spot, assuming G4 or Westlife don't get there first.
  • Not every young person is going to get onto Popstars, or sell a number one record.
  • These three lines from one song from the current number one Hindi film soundtrack album (Kal Ho Naa Ho) in Mumbai say it all.
2Oneself: you must look after number one
More example sentences
  • The fact that he treated me like a loyal puppy never bothered me much because I knew that I was always number one when it came to his heart, always one of the most important people in his life.
Synonyms
3Used euphemistically to refer to urine.
4A first lieutenant in the navy.

adjective

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Most important or prevalent; foremost: a number-one priority
More example sentences
  • ‘Our number-one priority was performance,’ says chief engineer Nobuaki Katayama.
  • Our number-one priority has been reducing the numbers of those at risk of internal sewer flooding and addressing the worst cases of external flooding.
  • Andy Brown, BSM roadshow manager, said: ‘Learning to drive is a number-one priority for most young people.’

Phrases

number one, number two, etc.

The shortest, or next shortest, etc., men’s cropped haircut produced with electric hair clippers.
More example sentences
  • Nearly all the women had hair on the curly/frizzy/wavy continuum and nearly all the men had a number one / two haircut.

Definition of number one in:

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