Usually means: Choosing not to participate voluntarily.
Definitions Related words Phrases Mentions
We found 14 dictionaries that define the word opt-out:

General (11 matching dictionaries)
  1. opt-out: Oxford Learner's Dictionaries
  2. opt-out, opt-out: Collins English Dictionary
  3. Opt-Out, Opt-out, opt-out: Wordnik
  4. opt-out: Cambridge Advanced Learner's Dictionary
  5. opt-out: Wiktionary
  6. opt-out: Dictionary.com
  7. Opt-out: Wikipedia, the Free Encyclopedia
  8. opt-out: AllWords.com Multi-Lingual Dictionary
  9. opt-out: TheFreeDictionary.com

Business (1 matching dictionary)
  1. WebmasterWorld Webmaster and Search Engine Glossary (No longer online)

Computing (2 matching dictionaries)
  1. opt-out: Netlingo
  2. opt-out: Encyclopedia

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Requiring a person or organization to choose explicitly to avoid or forbid something; tending to include by default; used particularly with regard to mailing lists and advertising.
noun:  The act of opting out of something.
noun:  (British, countable) A school or hospital that has withdrawn from local control.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.

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