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We found 6 dictionaries that define the word opt-in:

General (3 matching dictionaries)
  1. Opt-In, Opt-in, opt-in: Wordnik
  2. opt-in: Wiktionary
  3. Opt-in: Wikipedia, the Free Encyclopedia

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

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

Definitions from Wiktionary (opt-in)

adjective:  The property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertising.

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