from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One that is first in rank, order, or importance.
  • noun Slang One's own interests; oneself.
  • noun The act of urinating.
  • noun Urine.
  • adjective First in rank, order, or importance.
  • adjective Foremost in quality; first-rate.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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


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