Definitions from Wiktionary (retrofit)

▸ verb:  (transitive)
▸ verb:  To supply (a device, structure, etc.) with new components or parts that were not previously available or installed; to modernize.
▸ verb:  To add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc.
▸ verb:  (computing) Synonym of backport (“to retroactively supply a fix or feature to a previous version of a software product at the same time or after supplying it to the current version.”)
▸ verb:  (figuratively) To give new characteristics or make alterations (to someone or something) to suit them to changed circumstances.
▸ verb:  (intransitive) To supply a device, structure, etc., with new components or parts that were not previously available or installed.
▸ noun:  An act of supplying a device, structure, etc., with new components or parts that were not previously available or installed; a retrofitting.
▸ noun:  A change made to a device, structure, etc., by introducing components or parts that were not previously available or installed.
▸ Also see retrofit

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