Word.ws English Dictionary

opt-in

UK/ˈɒptˌɪn//ˈɑptˌɪn/

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.

Adjective

opt-in (not comparable)

  1. 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.
    • They set up an opt-in mailing list, so that those who wanted the notices could subscribe.

Antonyms of opt-in

Origin of opt-in

From opt + in.

Words formed from opt-in

Words that rhyme with opt-in

Questions about opt-in

What does opt-in mean?
Opt-in means 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.
What part of speech is opt-in?
Opt-in is an adjective.
How do you pronounce opt-in?
Opt-in is pronounced /ˈɒptˌɪn/ (UK).

Words near opt-in in the dictionary

  1. Opsterland
  2. opsters
  3. opt
  4. opt in
  5. opt out
  6. opt-in
  7. opt-out
  8. opt-outs
  9. opt.
  10. optable
  11. optacon

Source and license

Adapted from Wiktionary: opt-in (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Pronunciation audio from Wikimedia Commons, each file under its own free license: en-us-opt-in.ogg.

Cite this entry: “opt-in.” Word.ws, https://word.ws/opt-in. Based on Wiktionary, CC BY-SA 4.0.