repopulation

/riːˌpɑːpjəˈleɪʃən/
noun
  1. The process of filling a place with people or animals again after the population has decreased or disappeared.
    • The repopulation of the village began when new families moved into the empty houses.
    • The repopulation of the island took decades after the volcanic eruption.
    • Wildlife experts are monitoring the repopulation of fish in the cleaned river.
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