A person or thing that is acting or capable of acting.
Any component that is not passive. See Passivity (engineering).
Having the power or quality of acting; causing change; communicating action or motion; acting;—opposed to passive, that receives.
Quick in physical movement; of an agile and vigorous body; nimble.
In action; actually proceeding; working; in force
Given to action; constantly engaged in action; energetic; diligent; busy
Requiring or implying action or exertion
Given to action rather than contemplation; practical; operative
Brisk; lively.
Implying or producing rapid action.
(heading, grammar) About verbs.
(of source code) Eligible to be processed by a compiler or interpreter.
Not passive.
(gay sexual slang) (of a homosexual man) enjoying a role in anal sex in which he penetrates, rather than being penetrated by his partner.