Etymology
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-polis 

word-forming element meaning "city," from Greek polis "city, citadel" (see polis).

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-grad 

Russian, "city," from Old Church Slavonic gradŭ "town, city, citadel," from PIE *ghor-dho-, from root *gher- (1) "to grasp, enclose," with derivatives referring to enclosure.

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-y (1)

noun suffix, in army, city, country, etc., from Old French -e, Latin -atus, -atum, past participle suffix of certain verbs, which in French came to be used to indicate "employment, office, dignity" (as in duché, clergié).

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