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We found 17 dictionaries with English definitions that include the word 40:
Click on the first link on a line below to go directly to a page where "40" is defined.

General (11 matching dictionaries)

1. 40: Vocabulary.com [home, info]
2. 40: Wordnik [home, info]
3. 40: Dictionary.com [home, info]
4. 40: Cambridge Dictionary of American English [home, info]
5. 40: Cambridge International Dictionary of Idioms [home, info]
6. 40: Rhymezone [home, info]
7. 40: Stammtisch Beau Fleuve Acronyms [home, info]
8. 40: Free Dictionary [home, info]
9. 40: Mnemonic Dictionary [home, info]
10. 40: WordNet 1.7 Vocabulary Helper [home, info]
11. 40: LookWAYup Translating Dictionary/Thesaurus [home, info]

Computing (1 matching dictionary)

12. 40, 40 (number): Encyclopedia [home, info]

Miscellaneous (2 matching dictionaries)

13. 40: Acronym Finder [home, info]
14. 40: AbbreviationZ [home, info]

Slang (2 matching dictionaries)

15. 40: Totally Unofficial Rap [home, info]
16. 40: Street Terms: Drugs and the Drug Trade [home, info]

Sports (1 matching dictionary)

17. 40: Card Games [home, info]

(Note: See fortys for more definitions.)

Quick definitions from WordNet (40) ▸ noun:  the cardinal number that is the product of ten and four ▸ adjective:  being ten more than thirty ▸ Also see fortys ▸ Words similar to 40 ▸ Usage examples for 40 ▸ Popular adjectives describing 40 ▸ Popular nouns described by 40 ▸ Words that often appear near 40 ▸ Rhymes of 40 ▸ Invented words related to 40