The noun region has 5 senses (first 3 from tagged texts)
1. (67) region, part -- (the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space")
2. (5) area, region -- (a part of an animal that has a special function or is supplied by a given artery or nerve; "in the abdominal region")
3. (2) region -- (a large indefinite location on the surface of the Earth; "penguins inhabit the polar regions")
4. region, neighborhood -- (the approximate amount of something (usually used prepositionally as in `in the region of'); "it was going to take in the region of two or three months to finish the job"; "the price is in the neighborhood of $100")
5. domain, region, realm -- (a knowledge domain that you are interested in or are communicating about; "it was a limited domain of discourse"; "here we enter the region of opinion"; "the realm of the occult")