We found 17 dictionaries that define the word optimise:

General (13 matching dictionaries)

1. optimise: Merriam-Webster
2. optimise: Collins English Dictionary
3. optimise: Vocabulary.com
4. Optimise, optimise: Wordnik
5. optimise: Cambridge Advanced Learner's Dictionary
6. optimise: Wiktionary
7. optimise: Dictionary.com
8. optimise: Rhymezone
9. optimise: FreeDictionary.org
10. optimise: Mnemonic Dictionary
11. optimise: TheFreeDictionary.com

Computing (2 matching dictionaries)

12. optimise: Free On-line Dictionary of Computing
13. optimise: Encyclopedia

Medicine (1 matching dictionary)

14. online medical dictionary (No longer online)

Science (1 matching dictionary)

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

(Note: See optimises as well.)

Definitions from Wiktionary ( ) ▸ verb:  Non-Oxford British English standard spelling of optimize. [(originally intransitive) To act optimistically or as an optimist.] Similar: optimize, maximise, minimise, utilise, prioritise, maximising, analyse, maximize, improve, more... Opposite: pessimize, deoptimize, downgrade, weaken, impair ▸ Words similar to optimise ▸ Usage examples for optimise ▸ Idioms related to optimise ▸ Wikipedia articles (New!) ▸ Words that often appear near optimise ▸ Rhymes of optimise ▸ Invented words related to optimise