retrofit - definition and synonyms

verb [transitive] 

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/ˈretrəʊˌfɪt/
present tense
I/you/we/theyretrofit
he/she/itretrofits
present participleretrofitting
past tenseretrofitted
past participleretrofitted
  1. to change or improve something such as a machine or a building by adding new parts, equipment, or features to it

derived word

retrofit

 

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noun [countable]
singularretrofit
pluralretrofits