| 1. | engaged in action; characterized by energetic work, participation, etc.; busy: an active life. |
| 2. | being in a state of existence, progress, or motion: active hostilities. |
| 3. | involving physical effort and action: active sports. |
| 4. | having the power of quick motion; nimble: active as a gazelle. |
| 5. | characterized by action, motion, volume, use, participation, etc.: an active market in wheat; an active list of subscribers. |
| 6. | causing activity or change; capable of exerting influence (opposed to passive ): active treason. |
| 7. | effective (opposed to inert ): active ingredients. |
| 8. | 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 (opposed to passive ): Writes in He writes a letter every day is an active verb form. |
| 9. | requiring or giving rise to action; practical: an active course. |
| 10. | (of a volcano) in eruption. |
| 11. | Accounting. profitable; busy: active accounts. |
| 12. | requiring personal effort or attention; not automatic: an active alarm system. |
| 13. | interest-bearing: active paper. |
| 14. | Medicine/Medical. acting quickly; producing immediate effects: active remedies. |
| 15. | Sociology. (of a crowd) engaging in purposeful activity, often of a militant nature. Compare expressive (def. 4). |
| 16. | Aerospace. able to transmit signals: an active communications satellite. |
| 17. | Electronics. (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. |
| 18. | (of a solar heating system) accumulating and distributing solar heat by mechanical means. |
| 19. | Military. serving on active duty. |
| 20. | Grammar.
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| 21. | an active person, member, subscriber, etc.: The circular was mailed only to the actives on our list. |
| 22. | Informal. something showing considerable action or activity: On the stock market there was heavy trading in the actives. |
active