UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈæktɪv/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈæktɪv/ ,USA pronunciation: respelling(aktiv)

WordReference Random House Learner's Dictionary of American English © 2020
ac•tive /ˈæktɪv/USA pronunciation   adj. 
  1. engaged in action or activity:an active life.
  2. being in existence, progress, or motion: active hostilities.
  3. marked by energetic involvement:active support.
  4. involving physical exertion:active sports.
  5. characterized by current activity, participation, or use:an active club member; an active bank account.
  6. having a great deal of vigorous activity:an active stock market.
  7. (of a chemical) effective;
    capable of producing an effect :Active ingredients in that toothpaste prevent cavities.
  8. Grammarof or relating to a voice in grammar, a verb form, or construction in which the subject is usually the person or thing that performs or causes the action of the verb. In the verb form write in I write letters every day, the verb write is active(opposed to passive ).
  9. Geology(of a volcano) currently in eruption or likely to erupt.
  10. Military(of military personnel) currently on duty and prepared for military action.

n. [countable]
  1. Grammarthe active voice, or a form in this voice: Put that verb into the active.
ac•tive•ly, adv. 
ac•tive•ness, n. [uncountable]See -act-.

WordReference Random House Unabridged Dictionary of American English © 2020
ac•tive  (aktiv),USA pronunciation adj. 
  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. Grammarnoting 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):Writesin He writes a letter every day is an active verb form.
  9. requiring or giving rise to action;
    practical:an active course.
  10. Geology(of a volcano) in eruption.
  11. Business[Accountableing.]profitable;
    busy:active accounts.
  12. requiring personal effort or attention;
    not automatic:an active alarm system.
  13. Businessinterest-bearing:active paper.
  14. [Med.]acting quickly;
    producing immediate effects:active remedies.
  15. Sociology(of a crowd) engaging in purposeful activity, often of a militant nature. Cf. expressive (def. 4).
  16. Aerospaceable 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. Energy(of a solar heating system) accumulating and distributing solar heat by mechanical means.
  19. Militaryserving on active duty.

  1. Grammar
    • the active voice.
    • a form or construction in the active voice.
  2. an active person, member, subscriber, etc.:The circular was mailed only to the actives on our list.
  3. Informal Termssomething showing considerable action or activity:On the stock market there was heavy trading in the actives.
active•ly, adv. 
active•ness, n. 
  • Latin
  • Middle French
  • Latin āctīvus (see act, -ive); replacing Middle English actif
  • 1300–50
    • 1.See corresponding entry in Unabridged acting;
    • 3.See corresponding entry in Unabridged Active, energetic, strenuous, vigorous imply a liveliness and briskness in accomplishing something.
      Active suggests quickness and diligence as opposed to laziness or dilatory methods:an active and useful person.Energetic suggests forceful and intense, sometimes nervous, activity:conducting an energetic campaign.Strenuous implies arduous and zealous activity with a sense of urgency:a strenuous effort.Vigorous suggests strong, effective activity:using vigorous measures to accomplish an end.
    • 4.See corresponding entry in Unabridged agile, sprightly.
    • 1.See corresponding entry in Unabridged lazy.
    • 5.See corresponding entry in Unabridged sluggish.

Collins Concise English Dictionary © HarperCollins Publishers::
active /ˈæktɪv/ adj
  1. in a state of action; moving, working, or doing something
  2. busy or involved: an active life
  3. physically energetic
  4. exerting influence; effective: an active ingredient
  5. denoting a voice of verbs used to indicate that the subject of a sentence is performing the action or causing the event or process described by the verb, as kicked in The boy kicked the football
  6. being fully engaged in military service (esp in the phrase on active service)
  7. (of a volcano) erupting periodically; not extinct
  8. (of the sun) exhibiting a large number of sunspots, solar flares, etc, and a marked variation in intensity and frequency of radio emission
  1. the active voice
  2. an active verb
Etymology: 14th Century: from Latin āctīvus. See act, -ive

ˈactively adv ˈactiveness n
'active' also found in these entries (note: many are not synonyms or translations):
Collocations: has (such) an active [mind, imagination], [have, lead] an active lifestyle, has a very active [mind, imagination], more...

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