We found 38 dictionaries that define the word optimal:

General (23 matching dictionaries)

1. optimal: Longman Dictionary of Contemporary English
2. optimal: Merriam-Webster
3. optimal: Oxford Learner's Dictionaries
4. optimal: American Heritage Dictionary of the English Language
5. optimal: Collins English Dictionary
6. optimal: Vocabulary.com
7. Optimal, optimal: Wordnik
8. optimal: Cambridge Advanced Learner's Dictionary
9. optimal: Wiktionary
10. optimal: Webster's New World College Dictionary, 4th Ed.
11. optimal: The Wordsmyth English Dictionary-Thesaurus
12. optimal: Infoplease Dictionary
13. optimal: Dictionary.com
14. optimal: Online Etymology Dictionary
15. optimal: Cambridge Essential American English Dictionary
16. Optimal: Wikipedia, the Free Encyclopedia
17. optimal: Rhymezone
18. optimal, optimal, optimal(e) (-aux): AllWords.com Multi-Lingual Dictionary
19. optimal: FreeDictionary.org
20. optimal: Mnemonic Dictionary
21. optimal: TheFreeDictionary.com

Business (4 matching dictionaries)

22. Optimal: Deardorff's Glossary of International Economics
23. optimal: Legal dictionary
24. optimal: Financial dictionary
25. BusinessDictionary.com (No longer online)

Computing (3 matching dictionaries)

26. optimal: Free On-line Dictionary of Computing
27. optimal: Encyclopedia
28. optimal: Dictionary of Algorithms and Data Structures

Medicine (4 matching dictionaries)

29. optimal: Merriam-Webster Medical Dictionary
30. Lay Terms for Consent Forms (No longer online)
31. optimal: Medical dictionary
32. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

33. OPTIMAL: Acronym Finder

Science (2 matching dictionaries)

34. Mathematical Programming (No longer online)
35. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)

36. optimal: Urban Dictionary

(Note: See optimality as well.)

Definitions from Wiktionary ( ) ▸ adjective:  The best, most favourable or desirable, especially under some restriction. ▸ adjective:  (artificial intelligence) Describing a search algorithm that always returns the best result. ▸ noun:  The best of its kind Similar: optimum, best, ideal, suboptimal, optimize, nonoptimal, suboptimum, maximal, maximizing, suitable, more... Opposite: suboptimal, inferior, poor, inadequate, deficient Phrases: optimal solution, Optimal control, optimal value, Pareto optimal, Optimal tax, more... Adjectives: near, sub, pareto, global, non, cost, time, neighboring, local, user, quasi Colors:     blue,     green,     teal,     cyan,     turquoise, more... ▸ Word origin ▸ Words similar to optimal ▸ Usage examples for optimal ▸ Idioms related to optimal ▸ Wikipedia articles (New!) ▸ Popular adjectives describing optimal ▸ Popular nouns described by optimal ▸ Words that often appear near optimal ▸ Rhymes of optimal ▸ Invented words related to optimal