Definition of region noun from the Oxford Advanced American Dictionary

        

    region

     noun
    noun
    NAmE//ˈridʒən//
     
     
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  1. 1a large area of land, usually without exact limits or borders the Arctic/tropical/desert, etc. regions one of the most densely populated regions of North America
  2. 2one of the areas that a country is divided into, that has its own customs and/or its own government the Basque region of Spain
  3. 3 a part of the body, usually one that has a particular character or problem pains in the abdominal region
  4. Idioms
    in the region of
     
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    used when you are giving a number, price, etc. to show that it is not exact synonym approximately He earns somewhere in the region of $50,000.
See the Oxford Advanced Learner's Dictionary entry: region