to make active; cause to function or act.

to render more reactive; excite:
to activate a molecule.
to induce radioactivity.

to aerate (sewage) in order to accelerate decomposition of impure organic matter by microorganisms.

to make (carbon, a catalyst, molecules, etc.) more .
to hasten (reactions) by various means, as heating.

to place (a military unit or station) on an active status in an -ssigned capacity.
contemporary examples

he went so far as to throw an “activation party” in their honor just weeks before his september arrest.
the father who made his kids have s-x with a dog john l. smith december 15, 2014

historical examples

the activation thereafter had to be done in special equipment permitting of fine control of temperature.
america’s munitions 1917-1918 benedict crowell

how this activation is being aided and accelerated by another source of dynamic energy: irradiation from the sun.
the brain alexander blade

the scientist set the controls and turned on the activation switch.
the golden skull john blaine

it is usually measured by inserting materials of known composition and measuring their activation.
the atomic fingerprint bernard keisch

but non-military items also arrived for activation and test.
the machine that saved the world william fitzgerald jenkins

there is no known explanation for this type of activation of the enzyme.
the chemistry of plant life roscoe wilfred thatcher

activation meant turning them on and giving them a sort of basic training in the tasks they were designed to do.
the machine that saved the world william fitzgerald jenkins

then, as tony switched the activation circuit, the vertical line formed a pattern that varied in width from top to bottom.
the golden skull john blaine

verb (transitive)
to make active or capable of action
(physics) to make radioactive

to increase the rate of (a reaction)
to treat (a substance, such as carbon or alumina) so as to increase powers of adsorption

(physiol) to prepare by arousal (the body or one of its organs (e.g. the brain)) for action
to purify (sewage) by aeration
(us, military) to create, mobilize, or organize (a unit)

1906, noun of action from activate (v.).

1620s; see active + -ate (2). related: activated; activating.

Read Also:

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  • Active anaphylaxis

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  • Active barrier

    noun a movable object that prevents p-ssage of certain ent-ties but allows p-ssage of predefined ent-ties, esp. a security barricade examples a sliding gate is an active barrier; a retaining wall is a p-ssive barrier.

  • Active centre

    noun (biochem) the region in an enzyme molecule in which the reactive groups that partic-p-te in its action are juxtaposed also called active site historical examples wallingford, six miles above streatley, is a very ancient town, and has been an active centre for the making of english history. three men in a boat jerome k. […]

  • Active chronic hepatitis

    active chronic hepat-tis active chronic hepat-tis n. hepat-tis with chronic portal inflammation that extends into the liver parenchyma. also called posthepat-tic cirrhosis.

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