A megacity is a city with a population exceeding 10 million people.
The word is pronounced as /ˈmɛɡəˌsɪtɪ/.
Unlike smaller urban areas, a megacity is characterized by its very large population size, generally surpassing 10 million inhabitants. This term emphasizes the complex challenges and dynamics associated with such massive urban centers.
“a city having a population of one million or more.”
— Collins English Dictionary
A megacity is a vastly populated urban area with over 10 million residents, highlighting both its scale and complexity in modern geography.