number one

adj, noun — 12 senses

number one

adj

Etymology Piecewise doublet of numero uno.

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.
1 more example
  • Road safety is a daily tragedy that doesn’t seem to make the front pages even though it’s a number one killer. In some countries, it causes more deaths than small firearms, and in others, more than illnesses.2024 July 8, Lotte Knudsen, quotee, “Road crashes: a silent killer”, in Delegation of the European Union to the UN and other international organisations in Geneva, archived from the original on 10 Jul 2024:
2

Government, Law enforcement US, Slang Black, African-American.

number one

noun

Etymology Piecewise doublet of numero uno.

10 senses
  1. 1The most important person, the one who is in charge.
  2. 2Someone who is top of a ranking, who is ranked first.
  3. 3Oneself, being considered foremost, as by an egoist.
  4. 4Urine; urination.
  5. 5The single that has sold the most in a given period.
  6. 6The main goalkeeper of a team, so-called because they…
  7. 7The batsman who opens the batting.
  8. 8A first lieutenant.
  9. 9A large town where theatrical performances may expect to…
  10. 10Used other than figuratively or idiomatically: see number, one.
1

The most important person, the one who is in charge.

2

Someone who is top of a ranking, who is ranked first.

  • The phone rings, in the middle of the night / My father yells "what you gonna do with your life" / Oh, daddy, dear, you know you're still number one / But girls, they wanna have fun / Oh, girls just wanna have...1979, Robert Hazard, “Girls Just Want to Have Fun”, in She's So Unusual, performed by Cyndi Lauper, published 1983:
  • Djokovic came through 6-4 6-1 1-6 6-3 to end Nadal's reign as Wimbledon champion, before overtaking the Spaniard as world number one on Monday.2011 July 3, Piers Newbury, “Wimbledon 2011: Novak Djokovic beats Rafael Nadal in final”, in BBC Sport:
3

Oneself, being considered foremost, as by an egoist.

  • 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!1836 March – 1837 October, Charles Dickens, “(please specify the chapter name)”, in The Posthumous Papers of the Pickwick Club, London: Chapman and Hall, […], published 1837, →OCLC:
4

Childish, Euphemistic Urine; urination.

  • He might have got up, without the bell's sounding, to do his number one, or number two, in his great big white chamber-pot.1953, Samuel Beckett, Watt, [Paris]: Olympia Press, →OCLC:
5

Entertainment, Lifestyle, Music The single that has sold the most in a given period.

6

Ball games, Games, Hobbies, Lifestyle, Soccer, Sports The main goalkeeper of a team, so-called because they wear the number 1 on the back of their kit.

  • England number one Hart produced a magnificent moment to deny Van Persie once more just after the hour mark, leaping across his goal to fingertip the Dutchman's crashing 25-yard, top corner-bound drive away.2011 January 5, Jonathan Stevenson, “Arsenal 0 - 0 Man City”, in BBC:
7

Ball games, Cricket, Games, Hobbies, Lifestyle, Sports The batsman who opens the batting.

8

A first lieutenant.

9

Entertainment, Lifestyle, Theater A large town where theatrical performances may expect to achieve success.

10

Used other than figuratively or idiomatically: see number, one.

Derived terms
do number one, go number one, look out for number one, number one with a bullet, Christmas number one
Coordinate terms
number two, number three, and so on

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.