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activate

[ak-tuh-veyt] /ˈæk təˌveɪt/
verb (used with object), activated, activating.
1.
to make active; cause to function or act.
2.
Physics.
  1. to render more reactive; excite:
    to activate a molecule.
  2. to induce radioactivity.
3.
to aerate (sewage) in order to accelerate decomposition of impure organic matter by microorganisms.
4.
Chemistry.
  1. to make (carbon, a catalyst, molecules, etc.) more active.
  2. to hasten (reactions) by various means, as heating.
5.
to place (a military unit or station) on an active status in an assigned capacity.
Origin
1620-1630
1620-30; active + -ate1
Related forms
activation, noun
nonactivation, noun
overactivate, verb (used with object), overactivated, overactivating.
superactivate, verb (used with object), superactivated, superactivating.
unactivated, adjective
Can be confused
activate, actuate, stimulate.
Synonyms
1. actuate, start, turn on, set going.
Antonyms
1. stop, halt, check.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for activation
  • Crucially, vaccinia has ways of stopping this: by producing proteins that interfere with this activation system.
  • But everything that takes place after the click is a chore, and requires activation energy.
  • He would ask questions that delayed the activation of units, because he didn't think the planned flow was right.
  • In explanation, the researchers note that task switching seems to take place in two stages: goal shifting and rule activation.
  • Natural pain moderation depends on the activation of a brain cell surface protein called the mu-opioid receptor.
  • Furthermore, this neural response was graded, so that happy faces led to more activation than neutral faces.
  • Ultimately, the nerve ending stimulation leads to activation of a reflex inside the brain.
  • All three groups showed the same reduced activation of the left temporal lobe while reading.
  • Following activation, all available satellites are tasked to acquire data over the requested area.
  • Having lost my remote control countless times, the voice activation feature seems pretty handy.
British Dictionary definitions for activation

activate

/ˈæktɪˌveɪt/
verb (transitive)
1.
to make active or capable of action
2.
(physics) to make radioactive
3.
(chem)
  1. to increase the rate of (a reaction)
  2. to treat (a substance, such as carbon or alumina) so as to increase powers of adsorption
4.
(physiol) to prepare by arousal (the body or one of its organs (e.g. the brain)) for action
5.
to purify (sewage) by aeration
6.
(US, military) to create, mobilize, or organize (a unit)
Derived Forms
activation, noun
activator, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for activation
n.

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

activate

v.

1620s; see active + -ate (2). Related: Activated; activating.

Online Etymology Dictionary, © 2010 Douglas Harper
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