verb (used with object), reactivated, reactivating.
to render active again; revive.
verb (used without object), reactivated, reactivating.
to be active again.

1900–05; re- + activate

reactivation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reactivate (rɪˈæktɪˌveɪt)
(tr) to make (something) active or functional again

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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Word Origin & History

1903, from re- "back, again" + activate (see active).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

reactivate re·ac·ti·vate (rē-āk'tə-vāt')
v. re·ac·ti·vat·ed, re·ac·ti·vat·ing, re·ac·ti·vates

  1. To make active again.

  2. To restore the ability to function or the effectiveness of.

re·ac'ti·va'tion n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Based on this idea, a comet that ceases spewing material will remain inactive
  unless something happens to reactivate it.
Engineers are now trying to reactivate monitoring systems, such as those
  measuring temperatures of the spent fuel rods.
Instead, the west should strain to find ways to redirect its declining fiscal
  firepower to reactivate domestic credit.
It is important, therefore, to understand various species' ability to
  reactivate anti-predator responses following reintroduction.
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