reinvest Syllabification: (re·in·vest)Pronunciation: /ˌrē-inˈvest/Definition of reinvest verb [with object] put (the profit on a previous investment) back into the same place:the enterprise had been expanded by reinvesting profitsDerivatives reinvestmentPronunciation: /-ˈvestmənt/ noun reinvest in other Oxford dictionaries Definition of reinvest in the British & World English dictionary