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We found 11 dictionaries with English definitions that include the word number 1:
Click on the first link on a line below to go directly to a page where "number 1" is defined.

General (9 matching dictionaries)

1. number 1: Vocabulary.com [home, info]
2. number 1: Dictionary.com [home, info]
3. Number 1 (Big Bang album), Number 1 (Goldfrapp song), Number 1 (Nelly song), Number 1 (O-Zone album), Number 1 (Tinchy Stryder song): Wikipedia, the Free Encyclopedia [home, info]
4. number 1: Rhymezone [home, info]
5. number 1: Free Dictionary [home, info]
6. number 1: Mnemonic Dictionary [home, info]
7. number 1: WordNet 1.7 Vocabulary Helper [home, info]
8. number 1: LookWAYup Translating Dictionary/Thesaurus [home, info]
9. number 1: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

10. number 1: Encyclopedia [home, info]

Slang (1 matching dictionary)

11. number 1: Urban Dictionary [home, info]

(Note: See number_1s for more definitions.)

Quick definitions from WordNet (number 1) ▸ noun:  the first element in a countable series ▸ Also see number_1s ▸ Words similar to number 1 ▸ Usage examples for number 1 ▸ Words that often appear near number 1 ▸ Rhymes of number 1 ▸ Invented words related to number 1