o‧ver‧pop‧u‧la‧tion /ˌəʊvəpɒpjəˈleɪʃən, ˌəʊvəpɒpjʊˈleɪʃən $ ˌoʊvərpɑːp-/ noun [uncountable]
when there are too many people living in a particular place:
efforts to reduce overpopulation
—overpopulated /ˌəʊvəˈpɒpəleɪtəd, ˌəʊvəˈpɒpʊleɪtəd $ ˌoʊvərˈpɑːp-/ adjective:
our overpopulated cities

[TahlilGaran] Dictionary of Contemporary English ▲