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number one

number one

436 1.7
The first and most important person or thing in a list
  • noun
  • /ˈnʌmbər wʌn/
translation icon : número uno
  • And tonight, we played the number-one team in the country.
  • number one priority
  • number one reason
  • rank number one

Then Trump turned to America's number one threat, wind.

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Examples

  • I am the world's number one mystery writer.

  • In the competition, her performance was clearly number one among all the participants.

  • So that will be my number one book without a doubt.

  • Well, I, I think it is the number one issue we face.

  • Well, it was the number one method for many years.

  • Scott, what is your number one favorite product?

  • We already got the number one pick.

  • Protecting intellectual property continues to be the number one challenge in global design.

    Academic text (2008)
  • It's already the number one most-requested song of the week, and we're playing it all day long.

  • Educators thrive on success in accomplishing their number one goal -- helping young people learn.

    Academic text (1992)

Synonyms

first place
vsnumber one
343 2.1

The top position in a competition or race

applies more widely to being the most important or best beyond contests
first
vsnumber one
7 1.0

A person or thing that comes before others in order

is about being the most important or best without stressing sequence
top of the pile
vsnumber one
  • UK
3 4.6

The most important position with the highest priority

is a neutral label for being the highest or most important
number one with a bullet
vsnumber one
  • Literature
3 9.3

A clear top item on charts or rankings that is much more popular than others

can mean top in rank or importance without implying total certainty
first among equals
vsnumber one
  • Formal
2 7.3

The most important person in a group of people who have the same position

is broader, naming a single best or most important without peer equality

Antonyms

64 1.0

The person or thing at the end of a list

1.2

To the greatest degree in a bad way

How Important

number one
436 1.7
runner-up
47 2.7
also-ran
2 7.9

Surface Forms

number one singular
number ones plural

Morphology

number + one

The meaning 'the most important person/priority' is directly derivable from combining 'number' (a rank) with 'one' (first), so the sense of being 'first' or 'top priority' is transparent. The pragmatic extension to refer to 'yourself' or to putting your own interests first is a natural, cross-linguistically common extension of 'being number one', so a B1 learner who knows the constituents will likely infer the meaning.

Etymology

Number one comes from lists and scoreboards where the person or thing with '1' is at the top. So being number one means being 'first', 'best', or the most important.