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retrofit

[v. re-troh-fit, re-troh-fit; n., adj. re-troh-fit] /v. ˈrɛ troʊˌfɪt, ˌrɛ troʊˈfɪt; n., adj. ˈrɛ troʊˌfɪt/
verb (used with object), retrofitted or retrofit, retrofitting.
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), retrofitted or retrofit, retrofitting.
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.
adjective
7.
being or characterized by a retrofit:
retrofit units.
Origin
retro- + fit1
Related forms
retrofittable, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for retro-fit

retrofit

/ˈrɛtrəʊˌfɪt/
verb -fits, -fitting, -fitted
1.
(transitive) to equip (a vehicle, piece of equipment, etc) with new parts, safety devices, etc, after manufacture
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
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Word Origin and History for retro-fit

retrofit

v.

1954, from retro- + fit (v.). Related: Retrofitted; retrofitting. As a noun, 1956, from the verb.

Online Etymology Dictionary, © 2010 Douglas Harper
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