Standard Lemma guide

opt-in

adj · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /ˈɒptˌɪn/
  • Atlantic-Canada, General-American: /ˈɑptˌɪn/
  • Atlantic-Canada, General-American: /ˈɑpˌtɪn/
  • Mid-Atlantic, US: Maryland Recorded audio is listed in the source snapshot.
  • Australian: /ˈɔptˌɪn/
  • New-Zealand: [ˈɔ̟ptˌən]
  • rhymes with -ɒpt

1

adj

Meaning 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.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Examples

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

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From opt + in.

Across languages

Translations

4 source translations are retained for this English entry.

  • German: unter vorhergehender Einwilligung — 1. The property of having to choose explicitly to join or permit something
  • German: vorhergehende Einwilligung erfordernd — 1. The property of having to choose explicitly to join or permit something
  • Polish: uczestniczący — 1. The property of having to choose explicitly to join or permit something
  • Spanish: de adhesión — 1. The property of having to choose explicitly to join or permit something