polis (n.) Look up polis at Dictionary.com
"ancient Greek city-state," 1894, from Greek polis, ptolis "citadel, fort, city, one's city; the state, community, citizens," from PIE *tpolh- "citadel; enclosed space, often on high ground, hilltop" (source also of Sanskrit pur, puram, genitive purah "city, citadel," Lithuanian pilis "fortress").