We found 15 dictionaries that define the word fails:

General (10 matching dictionaries)

1. fails: Merriam-Webster
2. fails: Collins English Dictionary
3. fails: Vocabulary.com
4. Fail's, Fails, fails: Wordnik
5. fails: Cambridge Advanced Learner's Dictionary
6. Fails, fails: Wiktionary
7. fails: Dictionary.com
8. fails: Cambridge Essential American English Dictionary
9. Fails: Rhymezone
10. fails: TheFreeDictionary.com

Business (2 matching dictionaries)

11. fails: Legal dictionary
12. fails: Financial dictionary

Computing (1 matching dictionary)

13. fails: Encyclopedia

Medicine (1 matching dictionary)

14. fails: Merriam-Webster Medical Dictionary

Miscellaneous (1 matching dictionary)

15. fails: Idioms

(Note: See fail as well.)

Definitions from WordNet (Fails) ▸ name:  A surname (common: 1 in 100000 families; popularity rank in the U.S.: #16551) Opposite: succeeds, achieves, excels, wins, conquers Types: epic fail, fail of the year, fail of the decade, fail of the century, fail of all time, more... Phrases: if all else fails, When Prophecy Fails, Jimmie Fails, When Gravity Fails, Nothing Fails, more... Adjectives: test, initial, she, love, man, fair, minded, such, hasty, impatient, careless ▸ Words similar to fails ▸ Usage examples for fails ▸ Idioms related to fails ▸ Wikipedia articles (New!) ▸ Words that often appear near fails ▸ Rhymes of fails ▸ Invented words related to fails