number one

number one (not comparable)

  1. (idiomatic) First; foremost; best, often used after its headword.
    Commuting to work is the number one reason to own a car.
    He is my enemy number one.

number one (plural number ones)

  1. The most important person, the one who is in charge.
  2. Someone who is top of a ranking, who is ranked first.
  3. Oneself, being considered foremost, as by an egoist.
    • , Charles Dickens, The Pickwick Papers
      No man should have more than two attachments—the first, to number one, and the second to the ladies; that's what I say—ha! ha!
  4. (childish, euphemistic) Urine; urination.
  5. (music) The single that has sold the most in a given period.
  6. (soccer) The main goalkeeper of a team, so-called because they wear the number 1 on the back of their kit.
  7. (cricket) The batsman who opens the batting.
  8. A first lieutenant.
  9. (theater) A large town where theatrical performances may expect to achieve success.
  10. Used other than with a figurative or idiomatic meaning: see number, one
  • Russian: гла́вный
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