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deactivate

American  
[dee-ak-tuh-veyt] / diˈæk təˌveɪt /

verb (used with object)

deactivates, present (3rd person singular) deactivated, past participle, past deactivating present participle
  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)

deactivates, present (3rd person singular) deactivated, past participle, past deactivating present participle
  1. Physical Chemistry. to lose radioactivity.

deactivate British  
/ diːˈæktɪˌveɪt /

verb

  1. (tr) to make (a bomb, etc) harmless or inoperative

  2. (intr) to become less radioactive

  3. (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

"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

Other Word Forms

Derived Forms

Etymology

Origin of deactivate

First recorded in 1900–05; de- + activate

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