POLIS
“ancient Greek city-state" (1894), from Greek polis "citadel, fort, city, one's city; the state, community, citizens," from root *TPOLH- "citadel; enclosed space, often on high ground, or a hilltop"
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AGORA
“open assembly place; chief public square and marketplace of a town; place of popular political assembly," from Greek agora "an assembly of the People” from ageirein "to assemble," from root *GER- meaning "to gather." Further senses of the Greek word connotes the act of "public speaking."