Definition of number one in English:

number one

Syllabification: num·ber one


  • 1Oneself: you must look after number one
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    • 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.
  • 2A person or thing that is the best or the most important in an activity or area: businesses that were number one in their markets
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    • 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.
  • 2.1A best-selling record or book: an album featuring seventeen top movie themes and six number ones
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    • 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.
  • 3Used euphemistically to refer to urine, especially in reference to children.
  • 4A lieutenant junior grade in the navy or the coast guard.
  • 5 (or number two, etc.) The shortest (or next shortest, etc.) men’s haircut produced with electric hair clippers.
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    • Nearly all the women had hair on the curly/frizzy/wavy continuum and nearly all the men had a number one / two haircut.


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  • 1Most important or prevalent: a number-one priority
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    • ‘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.’
  • 1.1Best-selling: a number-one album
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    • Riding the crest of this propaganda wave was the 1992 number-one best-selling book America: What Went Wrong by Donald Barlett and James Steele, one of the worst books of all time.
    • Despite their number-one album, Permission to Land, their dramatic stage style complete with catsuits and spaceships meant that no one could decide whether they were serious or a comedy act.
    • For the second week in a row now, Duff's greatest-hits collection is number-one album on the billboard chart, which is just out today.

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Pronunciation: ˌastrəˈgāSHən
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