<p><strong>Adjective</strong></p><ul><li>engaged in action; characterized by energetic work, participation, etc.; busy: an active life.</li><li>being in a state of existence, progress, or motion: active hostilities.</li><li>involving physical effort and action: active sports.</li><li>having the power of quick motion; nimble: active as a gazelle.</li><li>characterized by action, motion, volume, use, participation, etc.: an active market in wheat; an active list of subscribers.</li><li>causing activity or change; capable of exerting influence: active treason.</li><li>effective: active ingredients.</li><li>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: "He writes" in "He writes a letter every day" is an active verb form.</li><li>requiring or giving rise to action; practical: an active course.</li><li>(of a volcano) having erupted within the last 10,000 years and likely to do so again or currently in a state of eruption.</li><li>profitable; busy: active accounts.</li><li>requiring personal effort or attention; not automatic: an active alarm system.</li><li>interest-bearing: active paper.</li><li>acting quickly; producing immediate effects: active remedies.</li><li>(of a crowd) engaging in purposeful activity, often of a militant nature.</li><li>able to transmit signals: an active communications satellite.</li><li>(of a device or system) acting as a source of electrical energy, as a generator, or capable of amplifying or converting voltages or currents, as a transistor or diode.</li><li>(of a solar heating system) accumulating and distributing solar heat by mechanical means.</li><li>serving on active duty.</li></ul><p><strong>Noun</strong></p><ul><li>the active voice.</li><li>a form or construction in the active voice.</li><li>an active person, member, subscriber, etc.: The circular was mailed only to the actives on our list.</li><li>Informal: something showing considerable action or activity: On the stock market, there was heavy trading in the actives.</li></ul>