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We found 15 dictionaries with English definitions that include the word 400:
Click on the first link on a line below to go directly to a page where "400" is defined.

General (9 matching dictionaries)

1. 400: Merriam-Webster.com [home, info]
2. the 400: Oxford Learner's Dictionaries [home, info]
3. 400: Vocabulary.com [home, info]
4. 400: Dictionary.com [home, info]
5. 400: Rhymezone [home, info]
6. 400: Free Dictionary [home, info]
7. 400: Mnemonic Dictionary [home, info]
8. 400: LookWAYup Translating Dictionary/Thesaurus [home, info]
9. 400: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

10. 400, 400 (number): Encyclopedia [home, info]

Miscellaneous (3 matching dictionaries)

11. 400: Acronym Finder [home, info]
12. 400: AbbreviationZ [home, info]
13. the 400: Wordcraft Dictionary [home, info]

Slang (1 matching dictionary)

14. 400: Totally Unofficial Rap [home, info]

Sports (1 matching dictionary)

15. 400: Card Games [home, info]

(Note: See 400s for more definitions.)

Quick definitions from WordNet (400) ▸ adjective:  being one hundred more than three hundred ▸ Also see 400s ▸ Words similar to 400 ▸ Usage examples for 400 ▸ Idioms related to 400 (New!) ▸ Popular nouns described by 400 ▸ Words that often appear near 400 ▸ Rhymes of 400 ▸ Invented words related to 400