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We found 26 dictionaries with English definitions that include the word number one:
Click on the first link on a line below to go directly to a page where "number one" is defined.

General (23 matching dictionaries)

1. number one: Merriam-Webster.com [home, info]
2. number one: Oxford Dictionaries [home, info]
3. number one: American Heritage Dictionary of the English Language [home, info]
4. number one: Collins English Dictionary [home, info]
5. number one: Vocabulary.com [home, info]
6. number one, number one: Macmillan Dictionary [home, info]
7. Number-One, number-one: Wordnik [home, info]
8. number one: Cambridge Advanced Learner's Dictionary [home, info]
9. number one: Wiktionary [home, info]
10. number one: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. number one: Infoplease Dictionary [home, info]
12. number one: Dictionary.com [home, info]
13. number one: UltraLingua English Dictionary [home, info]
14. 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 [home, info]
15. number one: Rhymezone [home, info]
16. Number One: Dictionary of Phrase and Fable (1898) [home, info]
17. number one: Free Dictionary [home, info]
18. number one: Mnemonic Dictionary [home, info]
19. number one: WordNet 1.7 Vocabulary Helper [home, info]
20. number one: LookWAYup Translating Dictionary/Thesaurus [home, info]
21. number-one, number one: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

22. Number One (song), Number One, number-one: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

23. number-one, number one: Idioms [home, info]

Slang (1 matching dictionary)

24. Number One: Urban Dictionary [home, info]

(Note: See number_ones for more definitions.)

Quick definitions from WordNet (number one) ▸ 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 ▸ Also see number_ones ▸ Words similar to number one ▸ Usage examples for number one ▸ Words that often appear near number one ▸ Rhymes of number one ▸ Invented words related to number one