[v. re-troh-fit, re-troh-fit; n., adj. re-troh-fit]
verb (used with object), retrofitted or retrofit, retrofitting.
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.
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), retrofitted or retrofit, retrofitting.
(of new or modified parts, equipment, etc.) to fit into or onto existing equipment.
to replace existing parts, equipment, etc., with updated parts or systems.
something that has been retrofitted.
an instance of updating, enlarging, etc., with new or modified equipment: A retrofit could save thousands of dollars.
being or characterized by a retrofit: retrofit units.

retro- + fit1

retrofittable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
retrofit (ˈrɛtrəʊˌfɪt)
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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Word Origin & History

1954, from retro(active) + (re)fit.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Especially if every food producer would retrofit their gas tanks to run on
  restaurant grease.
Our technology can be used to retrofit existing parabolic troughs and solar
  power towers to increase their efficiency.
The old model for operating rooms was that hospitals would build anew or
  retrofit old rooms to accommodate new technologies.
One idea is to give direct incentives for homeowners to retrofit their homes to
  improve energy efficiency.
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