opt-in

See also: opt in

English

Etymology

From opt +‎ in

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.

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