For the butterfly genus, see Acropolis (genus).

Acropolis (Gr. acron, edge + polis, city) literally means the edge of a town or a high city. For purposes of the defense, early settlers naturally chose elevated ground, frequently a hill with precipitous sides, and these early citadels became in many parts of the world the nuclei of large cities which grew up on the surrounding lower ground. The word "Acropolis", though Greek in origin and associated primarily with Greek cities (Athens, Argos, Thebes, and Corinth with its Acrocorinth), may be applied generically to all such citadels (Rome, Jerusalem, Celtic Bratislava, many in Asia Minor, or even Castle Rock in Edinburgh). The most famous example is the Acropolis of Athens which, by reason of its historical associations and the several famous buildings erected upon it (most notably the Parthenon), is generally known without qualification as simply "The Acropolis".