- ancient city in Lydia, W Asia Minor
- city & port in SE Pa., on the Delaware River
Origin of PhiladelphiaClassical Greek philadelphia, brotherly love from philos, loving + adelphos, brother: see monadelphous
- 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.
- 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.
- 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.x