Region can be used to mean:

1. Any considerable and connected part of a space or surface; specifically, a tract of land or sea of considerable but indefinite extent; a country; a district; in a broad sense, a place without special reference to location or extent but viewed as an entity for geographical, social or cultural reasons. The proper techniques of space delimitation covers regionalization.

   the equatorial regions

   the temperate regions

   the polar regions

   the upper regions of the atmosphere

2. An administrative subdivision of a city, a territory, a country or the European Union.
3. The geographically-specific encoding present on many commercially-produced DVDs.
4. (historical) Such a division of the city of Rome and of the territory about Rome, of which the number varied at different times; a district, quarter, or ward.
5. (figuratively) The inhabitants of a region or district of a country.
6. (anatomy) A place in or a part of the body in any way indicated.

   the abdominal regions

7. {obsolete} Place; rank; station; dignity.
8. {obsolete} The space from the earth's surface out to the orbit of the moon: properly called the elemental region.
9. For the QuickDraw data structure, see QuickDraw.

Regions are conceptual constructs and, thus, may vary among cultures and individuals.

Administrative regions

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The word "region" is taken from the Latin regio, and a number of countries have borrowed the term as the formal name for a type of subnational entity (eg, the región, used in Chile). In English, the word is also used as the conventional translation for equivalent terms in other languages (e.g., the область (oblast), used in Russia alongside with a broader term регион).

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