ret·ro·fit

[v. re-troh-fit, re-troh-fit; n., adj. re-troh-fit] verb, ret·ro·fit·ted or ret·ro·fit, ret·ro·fit·ting, noun, adjective
verb (used with object)
1.
to modify equipment (in airplanes, automobiles, a factory, etc.) that is already in service using parts developed or made available after the time of original manufacture.
2.
to install, fit, or adapt (a device or system) for use with something older: to retrofit solar heating to a poorly insulated house.
verb (used without object)
3.
(of new or modified parts, equipment, etc.) to fit into or onto existing equipment.
4.
to replace existing parts, equipment, etc., with updated parts or systems.
noun
5.
something that has been retrofitted.
6.
an instance of updating, enlarging, etc., with new or modified equipment: A retrofit could save thousands of dollars.
00:10
Retrofit is one of our favorite verbs.
So is skedaddle. Does it mean:
to run away hurriedly; flee.
chat, to converse
adjective
7.
being or characterized by a retrofit: retrofit units.

Origin:
retro- + fit1

ret·ro·fit·ta·ble, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
retrofit (ˈrɛtrəʊˌfɪt) [Click for IPA pronunciation guide]
 
vb , -fits, -fitting, -fitted
(tr) to equip (a vehicle, piece of equipment, etc) with new parts, safety devices, etc, after manufacture

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

retrofit
1954, from retro(active) + (re)fit.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
People typically don't think of installing solar thermal when they build or
  retrofit their homes.
Our technology can be used to retrofit existing parabolic troughs and solar
  power towers to increase their efficiency.
He and other critics say it will be too costly to retrofit existing coal plants
  with such technology.
These grads will become the implementers to retrofit existing cities into
  greener more efficient ones.
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