We found 28 dictionaries that define the word mental illness:

General (17 matching dictionaries)

1. mental illness: Merriam-Webster
2. mental illness: Oxford Learner's Dictionaries
3. mental illness: American Heritage Dictionary of the English Language
4. mental illness: Collins English Dictionary
5. mental illness: Vocabulary.com
6. mental-illness: Wordnik
7. mental illness: Cambridge Advanced Learner's Dictionary
8. mental illness: Wiktionary
9. mental illness: Infoplease Dictionary
10. mental illness: Dictionary.com
11. Mental Illness (album), Mental Illness, Mental illness (alphabetical list), Mental illness: Wikipedia, the Free Encyclopedia
12. mental illness: Rhymezone
13. mental illness: FreeDictionary.org
14. mental illness: Mnemonic Dictionary
15. mental illness: TheFreeDictionary.com

Business (3 matching dictionaries)

16. mental illness: Merriam-Webster Legal Dictionary
17. Glossary of Legal Terms (No longer online)
18. mental illness: Legal dictionary

Computing (1 matching dictionary)

19. mental illness: Encyclopedia

Medicine (5 matching dictionaries)

20. mental illness: Merriam-Webster Medical Dictionary
21. Reactive Attachment Disorder (No longer online)
22. online medical dictionary (No longer online)
23. mental illness: Medical dictionary
24. Rudy's List of Archaic Medical Terms (No longer online)

Miscellaneous (1 matching dictionary)

25. mental illness: Stanford Encyclopedia of Philosophy

Slang (1 matching dictionary)

26. mental illness: Urban Dictionary

Definitions from Wiktionary (mental illness) ▸ noun:  (uncountable, psychiatry) The property of being mentally ill; mental disorders taken as a whole. ▸ noun:  (countable, psychiatry) A mental disorder. Similar: mental disease, madness, illness, lunacy, possession, amentia, insanity, sanity, sickness, saneness, more... Opposite: sanity, saneness Types: schizophrenia, bipolar disorder, depression, anxiety, more... Phrases: legal mental illness, mental illness legal, National Alliance on Mental Illness, The Myth of Mental Illness, Choosing Mental Illness as a Virtue, more... Adjectives: sphinxlike, consensual, semiconscious, slanting, delusive, uncivilised, pent-up, alexithymic, repressed, soft, naif ▸ Words similar to mental illness ▸ Usage examples for mental illness ▸ Idioms related to mental illness ▸ Wikipedia articles (New!) ▸ Words that often appear near mental illness ▸ Rhymes of mental illness ▸ Invented words related to mental illness