<p><strong>Noun:</strong></p><ul><li>the external boundary of any surface or area.</li><li>Synonyms: perimeter, circumference.</li><li>Antonyms: center.</li><li>the external surface of a body.</li><li>Antonyms: center.</li><li>the edge or outskirts, as of a city or urban area.</li><li>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.</li><li>Anatomy: the area in which nerves end.</li></ul>