region in WordNet English dictionary

1. a part of an animal that has a special function or is supplied by a given artery or nerve
   "in the abdominal region"
   area  region 
   
2. 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"
   region  neighborhood 
   
3. the extended spatial location of something
   "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
   region  part 
   
4. a knowledge domain that you are interested in or are communicating about
   "it was a limited realm of discourse"; "here we enter the region of opinion"; "the realm of the occult"
   region  realm 
   
5. a large indefinite location on the surface of the Earth
   "penguins inhabit the polar regions"
   region