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Vinony

opt-in

noun

No English definition recorded for this entry.

L227843 on Wikidata ↗

Wiktionary

adj

Etymology: From opt + in.

  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.”