Opt-in Definition

adjective

Of a selection, 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 advertisement.

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

To choose to participate in something.

Wiktionary

Origin of Opt-in

  • From opt + in.

    From Wiktionary

  • opt + in

    From Wiktionary

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