We found 37 dictionaries that define the word optimal:

General (23 matching dictionaries)

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

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 (3 matching dictionaries)

29. Lay Terms for Consent Forms (No longer online)
30. optimal: Medical dictionary
31. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

32. OPTIMAL: Acronym Finder

Science (2 matching dictionaries)

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

Slang (1 matching dictionary)

35. 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,     emerald,     sapphire,     sky blue,     sea green,     mint ▸ 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