noun
a citadel or fortified part of an ancient Greek city, typically built on a hill
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The Acropolis in Athens is a famous ancient citadel located on a high rocky outcrop above the city.
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Let's go check out the Acropolis while we're in Athens.
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That new building looks like a mini Acropolis.
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The CEO's office is like the acropolis of the company, overseeing everything from a high vantage point.