A metropolis is a large, important city that serves as a major center of activity, culture, and commerce for a region or country. When people call a city a metropolis, they mean it's both big and significant, a place where important things happen. New York City, London, and Tokyo are all metropolises, cities that influence the world around them.

A metropolis is the main city of a region, the place other towns look to for leadership and culture. It is a hub where businesses thrive, universities educate thousands, museums preserve art and history, and people from many backgrounds live and work together.

A metropolis has a certain energy and importance that sets it apart. It's the kind of place where major decisions get made, where new ideas spread, and where you can find almost anything you're looking for. When someone describes a bustling, crowded urban area, they might call it metropolitan, meaning it has that distinctive big-city character.