Definition of "megacities" [megacities]

• Plural form of megacity. (noun)

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• "So-called megacities, from Lagos to Mexico City, have exploded seemingly overnight."
• "Eighteenth-century London had one million inhabitants, not a large city by today's standards when there are more than twenty so-called megacities whose population exceeds ten million."
• "Category A represents the so-called megacities, while the smaller municipalities fall into Category C."