Usually means: Primary, highest in rank, importance.
Definitions Related words Phrases (New!) Mentions
We found 23 dictionaries that define the word number one:

General (19 matching dictionaries)
  1. number one: Merriam-Webster.com
  2. number one: Oxford Learner's Dictionaries
  3. number one: American Heritage Dictionary of the English Language
  4. number one: Collins English Dictionary
  5. number one: Vocabulary.com
  6. Number-One, number-one: Wordnik
  7. number one: Cambridge Advanced Learner's Dictionary
  8. number one: Wiktionary
  9. number one: The Wordsmyth English Dictionary-Thesaurus
  10. number one: Infoplease Dictionary
  11. number one: Dictionary.com
  12. Number One (Alexia song), Number One (Babylon 5), Number One (Helloween song), Number One (John Legend song), Number One (Nelly song), Number One (Pharrell Williams song), Number One (Pharrell song), Number One (Pist.On album), Number One (R. Kelly song), Number One (Racine album), Number One (Star Trek), Number One (disambiguation), Number One (magazine), Number One, Number one: Wikipedia, the Free Encyclopedia
  13. number one: Rhymezone
  14. Number One: Dictionary of Phrase and Fable (1898)
  15. number one: Mnemonic Dictionary
  16. number-one, number one: Dictionary/thesaurus
  17. number one: Free Dictionary

Computing (1 matching dictionary)
  1. Number One (song), Number One, number-one: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. number-one, number one: Idioms

Slang (2 matching dictionaries)
  1. number one, number one: Green’s Dictionary of Slang
  2. Number One: Urban Dictionary

(Note: See number_ones as well.)

Definitions from Wiktionary (number one)

adjective:  (idiomatic) First; foremost; best, often used after its headword.
adjective:  (US, law enforcement) Black, African-American.
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:  (childish, euphemistic) 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:  A first lieutenant.
noun:  (theater) A large town where theatrical performances may expect to achieve success.
noun:  Used other than figuratively or idiomatically: see number, one.

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