urbanization

/ER0 B AH0 N AH0 Z EY1 SH AH0 N/
noun
  1. 1

    The process of the formation and growth of cities

  2. 2

    The change in a country or region when its population migrates from rural to urban areas

  3. 3

    The proportion of a region's population that live in towns and cities; the rate at which this proportion is growing

Source: https://en.wiktionary.org/wiki/urbanization