world city; global city
A city that plays a significant role in the global economic, cultural, or political system. Often used in urban studies and international relations contexts.
Tokyo is regarded as one of the world cities.
London ranked high in the global city rankings.
国際都市 (international city) emphasizes a city's international character and openness, while 世界都市 (world city) specifically refers to a city's central role in the global economic or cultural network.
Compound of 世界 (world) and 都市 (city), likely a calque of English 'world city' or 'global city'.