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We found 25 dictionaries with English definitions that include the word undefined:
Click on the first link on a line below to go directly to a page where "undefined" is defined.

General (21 matching dictionaries)

1. undefined: Merriam-Webster.com [home, info]
2. undefined: Oxford Learner's Dictionaries [home, info]
3. undefined: Collins English Dictionary [home, info]
4. undefined: Vocabulary.com [home, info]
5. undefined: Macmillan Dictionary [home, info]
6. Undefined, undefined: Wordnik [home, info]
7. undefined: Wiktionary [home, info]
8. undefined: Infoplease Dictionary [home, info]
9. undefined: Dictionary.com [home, info]
10. undefined: Online Etymology Dictionary [home, info]
11. undefined: UltraLingua English Dictionary [home, info]
12. Undefined (mathematics), Undefined: Wikipedia, the Free Encyclopedia [home, info]
13. undefined: Rhymezone [home, info]
14. undefined: Webster's 1828 Dictionary [home, info]
15. undefined: Free Dictionary [home, info]
16. undefined: Mnemonic Dictionary [home, info]
17. undefined: WordNet 1.7 Vocabulary Helper [home, info]
18. undefined: LookWAYup Translating Dictionary/Thesaurus [home, info]
19. undefined: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

20. undefined: Legal dictionary [home, info]

Science (2 matching dictionaries)

21. Undefined: Eric Weisstein's World of Mathematics [home, info]
22. undefined: MATH SPOKEN HERE! [home, info]

Slang (1 matching dictionary)

23. undefined: Urban Dictionary [home, info]

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (undefined) ▸ adjective:  not precisely limited, determined, or distinguished ("An undefined term") ▸ Word origin ▸ Words similar to undefined ▸ Usage examples for undefined ▸ Idioms related to undefined (New!) ▸ Popular nouns described by undefined ▸ Words that often appear near undefined ▸ Rhymes of undefined ▸ Invented words related to undefined