Definition of "megacity" [megacity]

• A very large city; a megalopolis. (noun)

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• "The grandest expression of the world's population growth is in the word "megacity.""
• "As continental Europe's only "megacity" - a population greater than 10 million - Istanbul believes itself to be an international beacon of how a city can grow both successfully and rapidly."
• "A transformation process is underway to abolish these categories and replace them with a megacity, that is, a big single-tier city structured like our present TLCs."