verb (used with object)
to remove or retire (a ship, airplane, etc.) from active service.
to deactivate; shut down: to decommission a nuclear power plant.

1925–30; de- + commission Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decommission (ˌdiːkəˈmɪʃən)
(tr) to dismantle or remove from service (a nuclear reactor, weapon, ship, etc which is no longer required)

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

1922, originally with reference to warships, from de- + commission (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The cheapest way to decommission a nuclear power plant is to have its core
So why not decommission all our fossil fuel producing power plants and convert
  them to clean energy producing power plants.
Even now they show no sign of making moves to decommission their arms stocks.
It can cost more to decommission a site than to build it in the first place.
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