1.the extended spatial location of something;
the farming regions of France
2.a part of an animal that has a special function or is supplied by a given artery or nerve;
in the abdominal region
3.a large indefinite location on the surface of the Earth;
penguins inhabit the polar regions
4.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
5.a knowledge domain that you are interested in or are communicating about;
it was a limited domain of discourse