(intransitive) To choose; select.

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.

Expressing a wish or a choice. / (grammar) Related or pertaining to the optative mood.

(grammar) A mood of verbs found in some languages (e.g. Sanskrit, Old Prussian, and Ancient Greek, but not English), used to express a wish. / (grammar) A verb or expression in the optative mood.

simple past tense and past participle of opt

plural of optative

To choose to participate in something

In an optative way.

simple past tense and past participle of opt in

(grammar) Abbreviation of optative.