from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To provide (a jet, automobile, computer, or factory, for example) with parts, devices, or equipment not in existence or available at the time of original manufacture.
  • transitive v. To install or fit (a device or system, for example) for use in or on an existing structure, especially an older dwelling.
  • intransitive v. To fit into or onto equipment already in existence or service.
  • intransitive v. To substitute new or modernized parts or systems for older equipment: an industrial plant that was retrofitting to meet new safety regulations.
  • n. Something that has been retrofitted or that has undergone retrofitting.
  • n. An instance of modernizing or expanding with new or modified parts, devices, systems, or equipment: a retrofit for the heating system.
  • adj. Relating to or being a retrofit: a retrofit kit for the homeowner; an energy-saving retrofit program; a large retrofit market.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To add or substitute new parts or components to some device, structure etc., that were not previously available; to modernize
  • v. To fix an older version (or older versions) as part of the same process of fixing the newest version; to backport
  • n. Something that has been retrofitted
  • n. The act of retrofitting
  • adj. of, relating to, or being a retrofit

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. substitute new or modernized parts or equipment for older ones
  • v. fit in or on an existing structure, such as an older house
  • n. the act of adding a component or accessory to something that did not have it when it was manufactured
  • v. provide with parts, devices, or equipment not available or in use at the time of the original manufacture
  • n. a component or accessory added to something after it has been manufactured


Blend of retro- and refit (Wiktionary)


  • I put in retrofit electrical boxes, network jacks and wall plates.

    Scripting News for 11/10/2006 « Scripting News Annex

  • Work has already begun on the $20 million retrofit, which is being done as a joint project involving the Clinton Climate Initiative, Rocky Mountain Institute, Johnson Controls, and Jones Lang LaSalle, and is part of a greater $500 million in planned renovations.


  • But there are lighting markets that LEDs will have difficulty penetrating even when they are the most efficient white light source, namely retrofit markets for standard light bulbs (i.e. you will keep your CFLs for some time yet.)

    Alternative Energy Stocks

  • Cutter calls the retrofit panel a perfect solution for owners looking for the enhanced situational awareness, pilot workload reduction and safety that a glass cockpit provides without the need of upgrading to a completely new aircraft.

    Aero-News Network

  • The retrofit is a-- it would certainly be discretionary. Home Page

  • The plan calls for more than 1,800 projects to "retrofit" parking lots, streets and other sites where hard surfaces keep rainwater from filtering naturally into the ground.

    Massive Anacostia River cleanup plan unveiled

  • The corps 'plan calls for more than 1,800 projects, across the Anacostia's watershed in the District and suburban Maryland, that would "retrofit" parking lots, streets and other sites.

    Officials unveil $1.7 billion plan to clean Anacostia River

  • In 2003 the city decided to spend $125 million to "retrofit" the incinerator to bring it up to code.

    Harrisburg Surrender

  • E-mail or Contact 516-deleted to discuss your "retrofit" and make an appointment.

    Down With Gears, or Down With Gears: Figuring Out What to Ride

  • This $999 SPECIAL includes a new carbon frame, new matching carbon seatpost and new carbon fork with all the associated "retrofit" labor included.

    Down With Gears, or Down With Gears: Figuring Out What to Ride


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