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Meaning of population explosion

popula'tion explo"sion

Pronunciation: [key]
  1. the rapid increase in numbers of a particular species, esp. in the world's human population since the end of World War II, attributed to an accelerating birthrate, a decrease in infant mortality, and an increase in life expectancy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.