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 / (Britain, countable) A school or hospital that has withdrawn from local control.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 choose not to participate in something.

plural of opt-out

simple past tense and past participle of opt out

present participle of opt out

Third-person singular simple present indicative form of opt out