Longman Dictionary of Contemporary English homepage

retrofit

 verb
     
ret‧ro‧fit past tense and past participle retrofitted, present participle retrofitting [transitive]
to improve a machine, piece of equipment, building etc by putting new and better parts in it after it has been used for some time:
plans to retrofit oil boilers
—retrofit noun [countable]
—retrofitting noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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