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 assigned 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 Sex 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:

  • Activation energy

    the least amount of energy required to activate atoms or molecules to a state in which they can undergo a chemical reaction. activation energy (āk’tə-vā’shən) The least amount of energy needed for a chemical reaction to take place. Some elements and compounds react together naturally just by being close to each other, and their activation […]

  • Activation record

    activation record compiler (Or “data frame”, “stack frame”) A data structure containing the variables belonging to one particular scope (e.g. a procedure body), as well as links to other activation records. Activation records are usually created (on the stack) on entry to a block and destroyed on exit. If a procedure or function may be […]

  • Activator

    a person or thing that . Chemistry, Biochemistry. a catalyst. any impurity in a mineral that causes luminescence. Compare (def 3). Orthodontics. a removable appliance, usually of hard plastic, that is worn in the mouth instead of a fixed appliance to help align the teeth and improve the relationship of the lower jaw to the […]

  • Active

    engaged in ; characterized by energetic work, participation, etc.; busy: an active life. being in a state of existence, progress, or motion: active hostilities. involving physical effort and : active sports. having the power of quick motion; nimble: active as a gazelle. characterized by , motion, volume, use, participation, etc.: an active market in wheat; […]

  • Active anaphylaxis

    active anaphylaxis active anaphylaxis ac·tive anaphylaxis (āk’tĭv) n. The anaphylactic response produced in an individual following inoculation with an antigen to which the person is sensitized.

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