from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One that is first in rank, order, or importance.
  • n. Slang One's own interests; oneself: watching out for number one.
  • n. Informal The act of urinating.
  • n. Informal Urine.
  • adj. First in rank, order, or importance: the number one team in the nation; our number one problem.
  • adj. Foremost in quality; first-rate: bought some number one farmland.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. First; foremost; best.
  • n. the most important person, the one who is in charge
  • n. someone who is top of a ranking, who is ranked first.
  • n. oneself, being considered foremost, as by an egoist
  • n. Urine; urination.
  • n. the single that has sold the most in a given period.
  • n. The main goalkeeper of a team, so-called because they wear the number 1 on the back of their kit.
  • n. The batsman who opens the batting.
  • n. Used other than as an idiom: see number,‎ one.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a reference to yourself or myself etc.; `take care of number one' means to put your own interests first
  • n. the first element in a countable series
  • n. the first or highest in an ordering or series


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