overpopulatePronunciation: /əʊvəˈpɒpjʊleɪt/Definition of overpopulate verb [with object] (often as adjective overpopulated) populate (an area) in excessively large numbers:an overpopulated countryDerivatives overpopulationPronunciation: /-ˈleɪʃ(ə)n/ noun overpopulate in other Oxford dictionaries Definition of overpopulate in the US English dictionary