Of a selection, the property of having to choose explicitly to avoid or forbid something; a decision having the default option being inclusion or permission; used particularly with regard to mailing lists and advertisement.

The act of opting out of something. / (Britain, countable) A school or hospital that has withdrawn from local control.

To elect as a fellow member of a group, such as a committee. / To commandeer, appropriate or take over. / To absorb or assimilate into an established group.

present participle of opt out

simple past tense and past participle of opt out

simple past tense and past participle of co-opt

present participle of co-opt

plural of opt-out

(Internet, marketing) The situation where a subscriber to a newsletter etc. first provides their e-mail address and then receives a confirmation request to that address, requiring them to take further action (such as clicking a hyperlink) to activate the subscription.

Alternative form of cooptative