a part of a structure having some specific characteristic or function | the ambiguous region between two categories or states or conditions (usually containing some features of both) |
the extent of a 2-dimensional surface enclosed within a boundary | an unoccupied area between the front lines of opposing armies |
a part of an animal that has a special function or is supplied by a given artery or nerve | land that is unowned and uninhabited (and usually undesirable) |
a subject of study | |
a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography) | |
a particular environment or walk of life | |