We found 34 dictionaries that define the word forty:

General (27 matching dictionaries)

1. forty: Merriam-Webster
2. forty: Oxford Learner's Dictionaries
3. forty: American Heritage Dictionary of the English Language
4. forty: Collins English Dictionary
5. forty: Vocabulary.com
6. Forty, forty: Wordnik
7. forty: Cambridge Advanced Learner's Dictionary
8. forty: Wiktionary
9. forty: Webster's New World College Dictionary, 4th Ed.
10. forty: The Wordsmyth English Dictionary-Thesaurus
11. forty: Infoplease Dictionary
12. Forty, forty: Dictionary.com
13. forty: Online Etymology Dictionary
14. forty: Cambridge Essential American English Dictionary
15. Forty (album), Forty: Wikipedia, the Free Encyclopedia
16. Forty: Online Plain Text English Dictionary
17. forty: Webster's Revised Unabridged, 1913 Edition
18. forty: Rhymezone
19. forty: AllWords.com Multi-Lingual Dictionary
20. forty: Webster's 1828 Dictionary
21. Forty: Dictionary of Phrase and Fable (1898)
22. forty: FreeDictionary.org
23. forty: Mnemonic Dictionary
24. forty: TheFreeDictionary.com
25. forty: Longman Dictionary of Contemporary English

Art (1 matching dictionary)

26. Forty: Dictionary of Symbolism

Computing (1 matching dictionary)

27. forty: Encyclopedia

Miscellaneous (2 matching dictionaries)

28. AbbreviationZ (No longer online)
29. forty: Idioms

Slang (2 matching dictionaries)

30. forty, forty, forty: Green’s Dictionary of Slang
31. forty: Urban Dictionary

Sports (1 matching dictionary)

32. Hickok Sports Glossaries (No longer online)

(Note: See 40 as well.)

Definitions from Wiktionary ( ) ▸ noun:  (slang) A bottle of beer containing forty fluid ounces. ▸ adjective:  Resembling or characteristic of a fort. Similar: XL, cardinal, twoscore, thirty, twenty, sixty, fifty, Seventy, fifteen, eighty, more... Opposite: twenty, few, young, little, sparse Types: forty-two, forty-three, forty-four, forty-five, forty-six, forty-seven, more... Phrases: forty hours, forty five, forty seconds, Forty Thieves, forty eight, more... Adjectives: four, section, lesson, three, part, page Colors:     ruby,     emerald,     sapphire,     amethyst,     topaz, more... ▸ Word origin ▸ Words similar to forty ▸ Usage examples for forty ▸ Idioms related to forty ▸ Wikipedia articles (New!) ▸ Popular adjectives describing forty ▸ Popular nouns described by forty ▸ Words that often appear near forty ▸ Rhymes of forty ▸ Invented words related to forty