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English definition of “megacity”

megacity

noun [C] ( plural megacities) ( also mega-city, mega city)
 
 
/ˈmeɡəˌsɪti/
a very large city that has a population of more than 10 million people and that is often made of two or more urban areas that have grown so much that they are connected: Lagos is a mega-city that now stretches over roughly 300 square kilometres. London is likely to become one of the world's biggest megacities by 2020.
(Definition of megacity from the Cambridge Business English Dictionary © Cambridge University Press)
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