regio

The English word “regio” has 2 meanings listed here.

noun

Any large area of a planet or moon that is strongly differentiated from neighbouring areas by colour or albedo.
A district of a city.

Learned borrowing from Latin regiō. Doublet of region.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.