We found 42 dictionaries that define the word opt:

General (26 matching dictionaries)

1. opt: Longman Dictionary of Contemporary English
2. opt: Merriam-Webster
3. opt, opt: Oxford Learner's Dictionaries
4. opt, opt: American Heritage Dictionary of the English Language
5. opt: Collins English Dictionary
6. opt: Vocabulary.com
7. Opt, opt, oPt: Wordnik
8. opt: Cambridge Advanced Learner's Dictionary
9. OPT, OPt, opt, oPt: Wiktionary
10. opt: Webster's New World College Dictionary, 4th Ed.
11. opt: The Wordsmyth English Dictionary-Thesaurus
12. opt: Infoplease Dictionary
13. opt, opt, opt-: Dictionary.com
14. opt: Online Etymology Dictionary
15. opt: Cambridge Essential American English Dictionary
16. OPT, Opt (disambiguation), Opt: Wikipedia, the Free Encyclopedia
17. opt: Rhymezone
18. opt: AllWords.com Multi-Lingual Dictionary
19. opt, opt-: MyWord.info
20. OPT, Opt: Stammtisch Beau Fleuve Acronyms
21. opt: FreeDictionary.org
22. opt: Mnemonic Dictionary
23. opt, opt: TheFreeDictionary.com
24. opt: Wikimedia Commons US English Pronunciations

Art (2 matching dictionaries)

25. opt-: A Cross Reference of Latin and Greek Elements
26. Glossary of Stamp Collecting Terms (No longer online)

Business (3 matching dictionaries)

27. MoneyGlossary.com (No longer online)
28. Travel Industry Dictionary (No longer online)
29. INVESTORWORDS (No longer online)

Computing (2 matching dictionaries)

30. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
31. /opt: Encyclopedia

Medicine (2 matching dictionaries)

32. opt: Merriam-Webster Medical Dictionary
33. opt(o)-, opt-: Medical dictionary

Miscellaneous (4 matching dictionaries)

34. OPT: Acronym Finder
35. OPT: Three Letter Words with definitions
36. AbbreviationZ (No longer online)
37. opt: Idioms

Slang (1 matching dictionary)

38. O.P.T, OPT: Urban Dictionary

Tech (2 matching dictionaries)

39. AUTOMOTIVE TERMS (No longer online)
40. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

(Note: See opted as well.)

Definitions from Wiktionary ( ) ▸ verb:  (intransitive) To choose; select. ▸ noun:  (linguistics) Abbreviation of Old Portuguese. [Synonym of Old Galician-Portuguese] ▸ noun:  Initialism of occupied Palestinian territories. ▸ noun:  Alternative form of oPt Similar: take, choose up, choose, pick, optate, elect, forechoose, cooptate, pick on, lease, more... Opposite: optic, optical Phrases: opt for, opt out, opt outs, co opt, opt in, more... Adjectives: photo, many, ophthalmic, ophthal, few, serial, possible, oceanic, likely, optical, grade ▸ Word origin ▸ Words similar to opt ▸ Usage examples for opt ▸ Idioms related to opt ▸ Wikipedia articles (New!) ▸ Popular adjectives describing opt ▸ Words that often appear near opt ▸ Rhymes of opt ▸ Invented words related to opt