retrofit

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retro|fit /r'etroʊfɪt/ (retrofits retrofitting retrofitted)
[VERB] V n
To retrofit a machine or a building means to put new parts or new equipment in it after it has been in use for some time, especially to improve its safety or make it work better.
Much of this business involves retrofitting existing planes...
[N-COUNT; also N n]
Retrofit is also a noun.
A retrofit may involve putting in new door jambs...

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