We found 41 dictionaries that define the word optimism:

General (27 matching dictionaries)

1. optimism: Longman Dictionary of Contemporary English
2. optimism: Merriam-Webster
3. optimism: Oxford Learner's Dictionaries
4. optimism: American Heritage Dictionary of the English Language
5. optimism: Collins English Dictionary
6. optimism: Vocabulary.com
7. Optimism, optimism: Wordnik
8. optimism: Cambridge Advanced Learner's Dictionary
9. optimism: Wiktionary
10. optimism: Webster's New World College Dictionary, 4th Ed.
11. optimism: The Wordsmyth English Dictionary-Thesaurus
12. optimism: Infoplease Dictionary
13. optimism: Dictionary.com
14. optimism: Online Etymology Dictionary
15. optimism: Cambridge Essential American English Dictionary
16. Optimism: Wikipedia, the Free Encyclopedia
17. Optimism: Online Plain Text English Dictionary
18. optimism: Webster's Revised Unabridged, 1913 Edition
19. optimism: Rhymezone
20. optimism: AllWords.com Multi-Lingual Dictionary
21. optimism: Webster's 1828 Dictionary
22. optimism: FreeDictionary.org
23. optimism: Mnemonic Dictionary
24. optimism: TheFreeDictionary.com
25. optimism: Wikimedia Commons US English Pronunciations

Art (2 matching dictionaries)

26. optimism: Dictionary of Philosophical Terms and Names
27. The Ism Book (No longer online)

Business (3 matching dictionaries)

28. OPTIMISM: Accounting Glossary
29. optimism: Legal dictionary
30. Accounting, Business Studies and Economics Dictionary (No longer online)

Computing (2 matching dictionaries)

31. optimism: Free On-line Dictionary of Computing
32. optimism: Encyclopedia

Medicine (4 matching dictionaries)

33. optimism: Merriam-Webster Medical Dictionary
34. online medical dictionary (No longer online)
35. optimism: Dictionary of Cancer Terms
36. optimism: Medical dictionary

Religion (1 matching dictionary)

37. Optimism: Catholic Encyclopedia

Science (1 matching dictionary)

38. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)

39. optimism: Urban Dictionary

(Note: See optimisms as well.)

Definitions from Wiktionary ( ) ▸ noun:  a tendency to expect the best, or at least, a favourable outcome ▸ noun:  the doctrine that this world is the best of all possible worlds ▸ noun:  the belief that good will eventually triumph over evil Similar: high hopes, hopefulness, benefit of the doubt, positivity effect, hope, positivity, blush, rose-colored glasses, result, sunlight, more... Opposite: pessimism, cynicism, negativity, despair, hopelessness Types: naive optimism, learned optimism, defensive pessimism, strategic optimism, more... Phrases: metaphysical optimism, strong optimism, Optimism bias, Learned optimism, opposite of optimism, more... Adjectives: such, cautious, excessive, false, naive, much, easy, general, guarded, unrealistic, american Colors:     yellow,     gold,     orange,     light green,     sky blue, more... ▸ Word origin ▸ Words similar to optimism ▸ Usage examples for optimism ▸ Idioms related to optimism ▸ Wikipedia articles (New!) ▸ Popular adjectives describing optimism ▸ Words that often appear near optimism ▸ Rhymes of optimism ▸ Invented words related to optimism