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Definition of Opt-out
1. Adjective. 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. ¹
2. Noun. the act of opting out of something ¹
3. Noun. (British) a school or hospital that has withdrawn from local control ¹
¹ Source: wiktionary.com