noun

1. a large and indefinite part of the surface of the earth; district
2. a division of the world characterized by a specific kind of plant or animal life
3. an area; place; space
4. a particular part of the world or universe
5. an administrative division of a country, as in Italy
6. a sphere or realm, as of art or science
7. a division or part of an organism, often called after its main part or organ the abdominal region
8. any of the levels used to describe the atmosphere or ocean

Etymology: ME regioun < Anglo-Fr regiun < OFr region < L regio < regere, to rule: see right