noun
megacity; city with over a million people
Refers to a city whose population is at least one million. Often used in demographic or urban planning contexts.
東京は世界有数の百万都市だ。
Tokyo is one of the world's leading megacities.
この地域には百万都市が三つある。
There are three cities with over a million people in this region.
Compound of 百万 (one million) and 都市 (city).