active
Noun pluralactives
Pluralactives
- 1Busy 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.
- 2Involved 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.
- 3
- 4Of 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.
- 5Requiring 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
- 6Serving 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.
- 7Currently 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.
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.
- 8A 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.
Less common meanings
- 9The voice of a verb in which the grammatical subject is the one carrying out the action, as in 'The committee approved the plan.'
Most style guides advise using the active wherever the doer of the action is known.
Put back into the active, the clause reads 'the inspectors found the fault.'
UsageUsually in the active, set against the passive: put a clause back into the active.
Oppositepassive
Note
The term names voice, not transitivity. 'The train arrived' has no object, yet it is in the active. Older grammars blurred the two and used the word to mean transitive (the older "transitive" use); the noun keeps only the sense of voice.
- 10Describing a verb, clause or sentence whose grammatical subject performs the action, rather than one in the passive.
The editor rewrote the report in the active voice to make it more direct.
Most style guides prefer active constructions to passive ones.
UsageMostly in the active voice and active sentences, set against passive ones.
Oppositepassive
Note
A grammarian's term that most readers meet through style advice: the active voice. In it the subject usually does the acting (the editor rewrote the report); in the passive the subject undergoes it (the report was rewritten). Both are forms of the same verb, so active here describes a construction, not a kind of verb. That is what separates it from the older "transitive" label.
Checked 5 Nov 2026 · 3 facts
- The subject typically performs the action, but this is not necessary: active clauses can express states or have an affected subject. hf.uio.no
- Active and passive can be constructions of the same verb. learnenglish.britishcouncil.org
- Active formerly served as a transitive label. dev.gutenberg.org
- 11A current, participating member of a group, especially a college fraternity or sorority, as distinct from its alumni or new pledges.
Every active in the chapter must attend the Monday meeting, while alumni are simply welcome.
The fraternity's actives met with alumni to plan the spring reunion.
UsageMostly plural, actives, set against alumni and new pledges.
Similarparticipant
Note
Fraternity life gives the noun its clearest use: actives are the current, participating members, as opposed to alumni. The Alcalde in 1989 reports surveys of "fraternity actives" and what they wrongly assume alumni want.
- 12Of a circuit component, able to supply power to a circuit or to amplify a signal, unlike a passive component.
Because it contains an amplifier, an active filter can boost a weak signal while it removes unwanted noise.
Op-amps and transistors are active devices, unlike resistors.
Oppositepassive
Note
Electronics draws the line by energy. Transistors and operational amplifiers can feed power into a circuit or boost a signal. Resistors, capacitors and inductors can only resist, store or pass energy along. Hence the active filter, the active device, and the plain active-versus-passive split on a parts list. The noun an active grows straight out of this adjective.
Checked 5 Nov 2026 · 4 facts
- The distinction between active and passive electronics concerns supplying energy or providing amplification. en.wikipedia.org
- Transistors and operational amplifiers are active components capable of amplifying signals. pages.hmc.edu
- Resistors, capacitors and inductors are passive components that dissipate, store or release energy. renesas.com
- Active filters use active components and can provide gain. analog.com
- 13A circuit component that is not passive: one able to supply energy or provide gain, such as a transistor or amplifier.
The design replaced two passives with a single active to cut the part count.
Each active on the board draws current from the supply rail.
Oppositepassive
Note
Engineers turn the adjective into a countable noun and pair it with passives. David Manners's Hitchhikers' Guide to Electronics in the '90s (1990) splits components into "actives and passives" and names the vacuum tube and the transistor as actives. The plural carries most of the weight. It works as compact shorthand on a parts list or in a design discussion, where an active simply means one such component.
Checked 5 Nov 2026 · 2 facts
- David Manners wrote Hitchhikers' Guide to Electronics in the '90s, first published in 1990. unibo.it
- Manners uses the exact phrase "actives and passives" and identifies vacuum tubes and transistors as active components. en.wiktionary.org
- 14Of a gay man, preferring the penetrating role in anal sex rather than the receptive one.
In his profile he listed himself as active, looking for a receptive partner.
The two men talked about whether each preferred to be active or passive.
Similartop
Note
Gay sexual slang borrows the pairing at the heart of the root "acting" sense: the active partner penetrates, and the passive one is penetrated. Top and bottom say the same thing. Because the word is so ordinary elsewhere, context carries the meaning. On a gay dating profile it is usually clear, but in other settings it can be misread, so use it only where the sexual sense is plainly in play.
- 15Designating any verb that expresses action, as distinct from mere existence or a state of being.
Writing coaches favor active verbs like 'sprint' over static ones like 'remain'.
An active verb conveys something happening rather than a condition that simply holds.
UsageNot the same as the active voice: a passive sentence can still use an active verb.
Similardynamic
Oppositestative
Note
The widest of the grammatical uses sorts verbs by meaning. Sprint, build and write are active, while be, seem and remain describe existence or a state. Linguists now usually frame this as dynamic versus stative. Writing coaches mean roughly this when they urge "active verbs."
- 16Designating a verb whose subject acts upon or affects something else; a transitive verb.
- 17Designating code or input that is eligible to be processed by a compiler or interpreter.
Showing meanings only.
Practice
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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.