de activate

deactivate

[dee-ak-tuh-veyt]
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:
1900–05; de- + activate

deactivation, noun
deactivator, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deactivate (diːˈæktɪˌveɪt)
 
vb
1.  (tr) to make (a bomb, etc) harmless or inoperative
2.  (intr) to become less radioactive
3.  (US) (tr) 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
 
deacti'vation
 
n
 
de'activator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

deactivate
1904, from de- + activate (see active). Related: Deactivation (1904).
Online Etymology Dictionary, © 2010 Douglas Harper
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