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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 noun from the Cambridge Business English Dictionary © Cambridge University Press)
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