1. an extremely large city or metropolitan area, typically with a population exceeding several million people

Examples

• Tokyo is considered a supercity with over 37 million residents in its metropolitan area.
• The government is planning infrastructure improvements for the growing supercity.
• Traffic congestion is a major challenge in any supercity.
• The supercity’s economy rivals that of entire countries.
• Urban planners study supercities to understand modern population trends.
• Living costs in a supercity are typically much higher than in smaller towns.