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We found 15 dictionaries with English definitions that include the word opt-out:
Click on the first link on a line below to go directly to a page where "opt-out" is defined.

General (12 matching dictionaries)

1. opt-out: Oxford Dictionaries [home, info]
2. opt-out, opt-out: Collins English Dictionary [home, info]
3. opt-out: Macmillan Dictionary [home, info]
4. Opt-Out, Opt-out, opt-out: Wordnik [home, info]
5. opt-out: Cambridge Advanced Learner's Dictionary [home, info]
6. opt-out: Wiktionary [home, info]
7. opt-out: Dictionary.com [home, info]
8. Opt-out: Wikipedia, the Free Encyclopedia [home, info]
9. opt-out: AllWords.com Multi-Lingual Dictionary [home, info]
10. opt-out: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

11. Opt-Out: WebmasterWorld Webmaster and Search Engine Glossary [home, info]

Computing (2 matching dictionaries)

12. opt-out: Netlingo [home, info]
13. opt-out: Encyclopedia [home, info]

Quick definitions from Macmillan ( ) Provided by Quick definitions from Wiktionary (opt-out) ▸ adjective:  Of a selection, the property of having to choose explicitly to avoid or forbid something; a decision having the default option being inclusion or permission; used particularly with regard to mailing lists and advertisement. ▸ noun:  The act of opting out of something. ▸ noun:  (Britain, countable) A school or hospital that has withdrawn from local control. ▸ noun:  (television, radio, countable) A regional broadcast that other stations in the network may elect not to include. ▸ Words similar to opt-out ▸ Usage examples for opt-out ▸ Popular adjectives describing opt-out ▸ Popular nouns described by opt-out ▸ Words that often appear near opt-out ▸ Rhymes of opt-out ▸ Invented words related to opt-out