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We found 39 dictionaries with English definitions that include the word optimal:
Click on the first link on a line below to go directly to a page where "optimal" is defined.

General (25 matching dictionaries)

1. optimal: Merriam-Webster.com [home, info]
2. optimal: Oxford Learner's Dictionaries [home, info]
3. optimal: American Heritage Dictionary of the English Language [home, info]
4. optimal: Collins English Dictionary [home, info]
5. optimal: Vocabulary.com [home, info]
6. optimal: Macmillan Dictionary [home, info]
7. Optimal, optimal: Wordnik [home, info]
8. optimal: Cambridge Advanced Learner's Dictionary [home, info]
9. optimal: Wiktionary [home, info]
10. optimal: Webster's New World College Dictionary, 4th Ed. [home, info]
11. optimal: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. optimal: Infoplease Dictionary [home, info]
13. optimal: Dictionary.com [home, info]
14. optimal: Online Etymology Dictionary [home, info]
15. optimal: Cambridge Dictionary of American English [home, info]
16. Optimal: Wikipedia, the Free Encyclopedia [home, info]
17. optimal: Rhymezone [home, info]
18. optimal, optimal, optimal(e) (-aux): AllWords.com Multi-Lingual Dictionary [home, info]
19. optimal: Free Dictionary [home, info]
20. optimal: Mnemonic Dictionary [home, info]
21. optimal: WordNet 1.7 Vocabulary Helper [home, info]
22. optimal: LookWAYup Translating Dictionary/Thesaurus [home, info]
23. optimal: Dictionary/thesaurus [home, info]

Business (4 matching dictionaries)

24. Optimal: Deardorff's Glossary of International Economics [home, info]
25. optimal: Legal dictionary [home, info]
26. optimal: Financial dictionary [home, info]
27. optimal: BusinessDictionary.com [home, info]

Computing (3 matching dictionaries)

28. optimal: Free On-line Dictionary of Computing [home, info]
29. optimal: Encyclopedia [home, info]
30. optimal: Dictionary of Algorithms and Data Structures [home, info]

Medicine (3 matching dictionaries)

31. OPTIMAL: Lay Terms for Consent Forms [home, info]
32. optimal: Medical dictionary [home, info]
33. optimal: online medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

34. OPTIMAL: Acronym Finder [home, info]

Science (2 matching dictionaries)

35. Optimal: Mathematical Programming [home, info]
36. optimal: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang (1 matching dictionary)

37. optimal: Urban Dictionary [home, info]

(Note: See optimally for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (optimal) ▸ adjective:  most desirable possible under a restriction expressed or implied ("Optimal concentration of a drug") ▸ Also see optimally ▸ Word origin ▸ Words similar to optimal ▸ Usage examples for optimal ▸ Idioms related to optimal (New!) ▸ Popular nouns described by optimal ▸ Words that often appear near optimal ▸ Rhymes of optimal ▸ Invented words related to optimal