noun a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography).
— synonyms: country
noun a subject of study.
noun a part of an animal that has a special function or is supplied by a given artery or nerve.
— synonyms: region
noun a particular environment or walk of life.
— synonyms: sphere, domain, orbit, field, arena
noun a part of a structure having some specific characteristic or function.
noun the extent of a 2-dimensional surface enclosed within a boundary.
— synonyms: expanse, surface_area