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WORDNET DICTIONARY

Noun overpopulation has 1 sense

• overpopulation(n = noun.group) - too much population;
is a kind of population
Derived form verb overpopulate₁

THESAURUS

overpopulation

avalanche, deluge, embarras de richesses, enough, extravagance, extravagancy, flood, inundation, landslide, lavishness, money to burn, more than enough, overabundance, overaccumulation, overbounteousness, overcopiousness, overdose, overlavishness, overluxuriance, overmeasure, overmuchness, overnumerousness, overplentifulness, overplenty, overprofusion, oversufficiency, oversupply, plenty, plethora, prodigality, redundancy, spate, superabundance, superflux

For further exploring for "overpopulation" in Webster Dictionary Online