plural of regional power

(international relations) A state that exercises significant power within a geographical region.

A regional municipality of Nova Scotia, Canada.

The Kennelly-Heaviside layer.

The region of Belgium consisting of the capital city, Brussels, and its suburbs.

(physics, meteorology) An extensive area of the Earth's surface over which bodies of air frequently remain for a sufficient time to acquire characteristic temperature and moisture properties imparted by that surface. Air so modified becomes identifiable as a distinct air mass. See airmass.

(astronomy) A large nebula of gas and plasma of glowing low density in which star formation has recently taken place.

plural of H II region

Xizang Zizhiqu

An autonomous region of China, located on the Tibetan Plateau and home to the Tibetan people