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deactivate

[dee-ak-tuh-veyt] /diˈæk təˌveɪt/
verb (used with object), deactivated, deactivating.
1.
to cause to be inactive; remove the effectiveness of.
2.
to demobilize or disband (a military unit).
3.
to render (a bomb, shell, or the like) inoperative, especially by disconnecting, removing, or otherwise interfering with the action of the fuze.
4.
Chemistry. to render (a chemical, enzyme, catalyst, etc.) inactive.
verb (used without object), deactivated, deactivating.
5.
Physical Chemistry. to lose radioactivity.
Origin
1900-1905
1900-05; de- + activate
Related forms
deactivation, noun
deactivator, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for de activator

deactivate

/diːˈæktɪˌveɪt/
verb
1.
(transitive) to make (a bomb, etc) harmless or inoperative
2.
(intransitive) to become less radioactive
3.
(transitive) (US) to end the active status of (a military unit)
4.
(chem) to return or cause to return from an activated state to a normal or ground state
Derived Forms
deactivation, noun
deactivator, 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 de activator

deactivate

v.

1904, from de- + activate. Related: Deactivated; deactivating; deactivation.

Online Etymology Dictionary, © 2010 Douglas Harper
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