1 : an area or region distinguished from adjacent parts by a distinctive feature or characteristic
2 : any of the regions of the surface of the Earth loosely divided according to latitude or longitude
3 : a part of a structure having some specific characteristic or function
4 : a subject of study
5 : a region marked off for administrative or other purposes
6 : a knowledge domain that you are interested in or are communicating about
7 : a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
