opt-in

UK/ˈɒptˌɪn/Atlantic Canada, US/ˈɑptˌɪn/Atlantic Canada, US/ˈɑpˌtɪn/Australia/ˈɔptˌɪn/

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.

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

Opposite
opt-out
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Meanings

adjectiveopt-in (not comparable)
  1. not comparableThe 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.

Synonyms & antonyms

Opposite
opt-out

Origin

From opt + in.

Full word history & related roots →

Translations

German unter vorhergehender Einwilligung, vorhergehende Einwilligung erfordernd
  • unter vorhergehender Einwilligung1. The property of having to choose explicitly to join or permit something
  • vorhergehende Einwilligung erfordernd1. The property of having to choose explicitly to join or permit something
Polish uczestniczący
  • uczestniczący1. The property of having to choose explicitly to join or permit something
Spanish de adhesión
  • de adhesión1. The property of having to choose explicitly to join or permit something

Rhymes & wordplay

Rhymes with opt-in

stoppeddroppedadoptopttoppedcroppedmoppedcoptco-opt
All rhymes →
Cite this entry
APA

opt-in. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/opt-in

MLA

“opt-in.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/opt-in. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “opt-in,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/opt-in.

Source: opt-in on Wiktionary, CC BY-SA 4.0.