We found 39 dictionaries that define the word optimism:

General (26 matching dictionaries)

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

Art (2 matching dictionaries)

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

Business (3 matching dictionaries)

27. OPTIMISM: Accounting Glossary
28. optimism: Legal dictionary
29. Optimism: Accounting, Business Studies and Economics Dictionary

Computing (2 matching dictionaries)

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

Medicine (3 matching dictionaries)

32. online medical dictionary (No longer online)
33. optimism: Dictionary of Cancer Terms
34. optimism: Medical dictionary

Religion (1 matching dictionary)

35. Optimism: Catholic Encyclopedia

Science (1 matching dictionary)

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

Slang (1 matching dictionary)

37. 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