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active

AK-tiv/ˈæk.tɪv/

Noun pluralactives

17 meanings of active

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  1. 1
    energeticadjective
    Busy and energetic, doing a lot, especially physically; of trade or a market, lively, with much going on.

    She remains remarkably active, juggling volunteer work, a book club, and daily runs.

    An active child needs plenty of outlets for all that restless energy.

    UsageCommon after stay or keep: stay active. Also active for your age: very active for eighty.

    Oppositeinactive, sluggish, idle

  2. 2
    involvedadjective
    Involved in the work of an organization, cause or activity, rather than simply being a member of it or watching from the side.

    She has been politically active since college, organizing voter drives every election year.

    The union has 4,000 members, but only a few hundred are active in its campaigns.

    Usageactive in a group or cause (active in her church), or with an adverb: politically active.

    Similarinvolved, engaged

    Oppositeinactive, passive

  3. 3
    adjective
    Currently operating, in progress, or in force rather than dormant or suspended.

    The investigation remains active, with detectives following several new leads.

    Once the contract is active, both parties must meet its terms.

    Similarworking, operative

    Oppositedormant, quiescent, inactive

  4. 4
    adjective
    Of a person, force or substance, having the power to act on other things or to cause an effect or change, rather than merely being acted on.

    Yeast is the active agent that makes the dough rise.

    In the experiment, heat was the active factor causing the chemical change.

    UsageOften in set phrases: active ingredient, active agent.

    Note

    It is defined by its partner, passive: the active thing acts, the passive one receives. That same pairing returns in grammar, electronics and slang, each time with its own twist.

  5. 5
    exerciseadjective
    Requiring or involving physical effort and exertion to perform or take part in.

    Mountaineering is an active pursuit demanding strength, stamina, and constant exertion.

    Her doctor recommended a more active lifestyle, with daily walks and stretching.

    Oppositesedentary

  6. 6
    militaryadjective
    Serving in the military full-time, rather than belonging to the reserves or having retired from service.

    After twelve years on active duty, he moved to the reserves and took a civilian job.

    The base is home to about 9,000 active and reserve personnel.

    UsageUsually in on active duty or in active service, set against the reserves.

  7. 7
    eruptingadjective
    Currently erupting or capable of erupting, releasing lava, ash, gas or steam, or producing tremors.

    Geologists confirmed that the volcano is still active after detecting fresh tremors.

    An active geyser nearby sent up jets of boiling water every hour.

    Oppositedormant, extinct

    Note

    Geology narrows the "in force" meaning to volcanoes and similar features. Its neighboring terms mark distinctions worth keeping straight. A dormant volcano is quiet for now but may wake again, and volcanologists often still count it as active; an extinct one is not expected to erupt at all. Calling a quiet volcano extinct when it is only dormant is the classic slip, and active covers both the eruption itself and the tremors that warn of one.

  8. 8
    nouncountable
    A substance in a skincare, cosmetic or medicinal product that delivers the intended effect, as distinct from the base that carries it.

    Dermatologists suggest adding one new active at a time so you can tell what your skin reacts to.

    The serum lists its actives, retinol and niacinamide, at the top of the label.

    UsageMostly plural: a serum's actives, strong actives.

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Origin

Latin agere ("to do, to act"), which goes back to Proto-Indo-European *h₂éǵeti, gave āctīvus; Old French made it actif and Middle English actyf. Taken apart in English, it is act plus the suffix -ive.