Adjective

(en adjective)

Having the power or quality of acting; causing change; communicating action or motion; acting;—opposed to passive, that receives.

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Quick in physical movement; of an agile and vigorous body; nimble.

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In action; actually proceeding; working; in force; — opposed to quiescent, dormant, or extinct.

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# Being an active volcano.

Given to action; constantly engaged in action; energetic; diligent; busy; — opposed to dull, sluggish, indolent, or inert.

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*

*:This new-comer was a man who in any company would have seemed striking.He was smooth-faced, and his fresh skin and well-developed figure bespoke the man in good physical condition through active exercise, yet well content with the world's apportionment.

Requiring or implying action or exertion;—opposed to sedentary or to tranquil.

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Given to action rather than contemplation; practical; operative; — opposed to speculative or theoretical.

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Brisk; lively.

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Implying or producing rapid action.

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About verbs.

#Applied to a form of the verb; — opposed to passive. See active voice.

#Applied to verbs which assert that the subject acts upon or affects something else; transitive.

#Applied to all verbs that express action as distinct from mere existence or state.

(lb) (of a homosexual man) enjoying a role in anal sex in which he penetrates, rather than being penetrated by his partner.

Adjective

(en adjective)

No longer in use; gone into disuse; disused or neglected (often by preference for something newer, which replaces the subject).

* {{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= The attack of the MOOCs , passage=Since the launch early last year of […] two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. University brands built in some cases over centuries have been forced to contemplate the possibility that information technology will rapidly make their existing business model obsolete .}}

(biology) Imperfectly developed; not very distinct.