metacity Directory References Contents Ask the Chatbot a Question metacity Ask the Chatbot a Question Also known as: hypercity Learn about this topic in these articles:megacities In megacity…20 million—are also known as metacities or hypercities. Read More Britannica ChatbotChatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.