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1. An ancient city northeast of the Dead Sea in modern-day Jordan. The chief city of the Ammonites, it was enlarged and embellished by Ptolemy II Philadelphus (285-246 bc) and named in honor of him. Amman, the capital of Jordan, is now on the site.
2. An ancient Greek city of Asia Minor in present-day western Turkey. Founded in the second century bc, Philadelphia was a center of early Christianity.
3. The largest city of Pennsylvania, in the southeast part of the state on the Delaware River. It was founded as a Quaker colony by William Penn in 1681 on the site of an earlier Swedish settlement. The First and Second Continental Congresses (1774 and 1775-1776) and the Constitutional Convention (1787) met in the city, which served as the capital of the United States from 1790 to 1800.
Phil′a·del′phi·an adj. & n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.