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We found 30 dictionaries with English definitions that include the word challenging:
Click on the first link on a line below to go directly to a page where "challenging" is defined.

General (26 matching dictionaries)

1. challenging: Merriam-Webster.com [home, info]
2. challenging: Oxford Learner's Dictionaries [home, info]
3. challenging: American Heritage Dictionary of the English Language [home, info]
4. challenging: Collins English Dictionary [home, info]
5. challenging: Vocabulary.com [home, info]
6. challenging: Macmillan Dictionary [home, info]
7. Challenging, challenging: Wordnik [home, info]
8. challenging: Cambridge Advanced Learner's Dictionary [home, info]
9. challenging: Wiktionary [home, info]
10. challenging: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. challenging: Infoplease Dictionary [home, info]
12. challenging: Dictionary.com [home, info]
13. challenging: UltraLingua English Dictionary [home, info]
14. challenging: Cambridge Dictionary of American English [home, info]
15. Challenging: Wikipedia, the Free Encyclopedia [home, info]
16. Challenging: Online Plain Text English Dictionary [home, info]
17. challenging: Rhymezone [home, info]
18. Challenging: AllWords.com Multi-Lingual Dictionary [home, info]
19. challenging: Webster's 1828 Dictionary [home, info]
20. challenging: Free Dictionary [home, info]
21. challenging: Mnemonic Dictionary [home, info]
22. challenging: WordNet 1.7 Vocabulary Helper [home, info]
23. challenging: LookWAYup Translating Dictionary/Thesaurus [home, info]
24. challenging: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

25. challenging: Legal dictionary [home, info]

Computing (1 matching dictionary)

26. challenging: Encyclopedia [home, info]

Medicine (1 matching dictionary)

27. challenging: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

28. challenging: Idioms [home, info]

(Note: See challenges for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (challenging) ▸ adjective:  disturbingly provocative ▸ adjective:  stimulating interest or thought ("A challenging hypothesis") ▸ adjective:  requiring full use of your abilities or resources ("Performed the most challenging task without a mistake") ▸ Also see challenges ▸ Words similar to challenging ▸ Usage examples for challenging ▸ Idioms related to challenging (New!) ▸ Popular nouns described by challenging ▸ Words that often appear near challenging ▸ Rhymes of challenging ▸ Invented words related to challenging