periphery: Meaning and Definition of

pe•riph•er•y

1. the external boundary of any surface or area.
2. the external surface of a body.
3. the edge or outskirts, as of a city or urban area.
4. the relatively minor, irrelevant, or superficial aspects of the subject in question: The preliminary research did not, of course, take me beyond the periphery of my problem.
5. the area in which nerves end.