Dictionary.com

deactivate

[ dee-ak-tuh-veyt ]
/ diˈæk təˌveɪt /
Save This Word!

verb (used with object), de·ac·ti·vat·ed, de·ac·ti·vat·ing.

to cause to be inactive; remove the effectiveness of.
to demobilize or disband (a military unit).
to render (a bomb, shell, or the like) inoperative, especially by disconnecting, removing, or otherwise interfering with the action of the fuze.
Chemistry. to render (a chemical, enzyme, catalyst, etc.) inactive.

verb (used without object), de·ac·ti·vat·ed, de·ac·ti·vat·ing.

Physical Chemistry. to lose radioactivity.

QUIZZES

THINK YOU’VE GOT A HANDLE ON THIS US STATE NICKNAME QUIZ?

Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
Question 1 of 8
Mississippi’s nickname comes from the magnificent trees that grow there. What is it?

Origin of deactivate

First recorded in 1900–05; de- + activate

OTHER WORDS FROM deactivate

de·ac·ti·va·tion, nounde·ac·ti·va·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for deactivate

British Dictionary definitions for deactivate

deactivate
/ (diːˈæktɪˌveɪt) /

verb

(tr) to make (a bomb, etc) harmless or inoperative
(intr) to become less radioactive
(tr) US to end the active status of (a military unit)
chem to return or cause to return from an activated state to a normal or ground state

Derived forms of deactivate

deactivation, noundeactivator, 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
See Today's Synonym