engaged in action; characterized by energetic work, participation, etc.; busy: an active life.
being in a state of existence, progress, or motion: active hostilities.
involving physical effort and action: active sports.
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having the power of quick motion; nimble: active as a gazelle.
characterized by action, motion, volume, use, participation, etc.: an active market in wheat; an active list of subscribers.
causing activity or change; capable of exerting influence: active treason.
effective: active ingredients.
Grammar. noting or pertaining to a voice of verbal inflection in which typically the subject of the sentence is represented as performing the action expressed by the verb: Writes in He writes a letter every day is an active verb form.
requiring or giving rise to action; practical: an active course.
Geology. having erupted within the last 10,000 years and likely to do so again or currently in a state of eruption.Compare dormant, extinct.
requiring personal effort or attention; not automatic: an active alarm system.
interest-bearing: active paper.
Medicine/Medical. acting quickly; producing immediate effects: active remedies.
Sociology. engaging in purposeful activity, often of a militant nature.Compare expressive.
Aerospace. able to transmit signals: an active communications satellite.
Electronics. acting as a source of electrical energy, as a generator, or capable of amplifying or converting voltages or currents, as a transistor or diode.
accumulating and distributing solar heat by mechanical means.