Definition of opt in in English:

opt in

Choose to participate in something: the database would not include a person’s name unless he opted in
More example sentences
  • Icelanders have the right to opt out of the scheme but Mannvernd, an organisation set up to stop the database going ahead, insists that the law should be reversed so that only medical information from citizens who chose to opt in is used.
  • For operators that choose to opt in, Government would buy their equipment and claims.
  • A green pricing option is best suited to municipal utility services that choose not to opt in to competition.
See parent entry: opt

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Word of the day inamorata
Pronunciation: ɪˌnaməˈrɑːtə
noun
a person's female lover