1) a city
1a) one's native city, the city in which one lives
1b) the heavenly Jerusalem
1b1) the abode of the blessed in heaven
1b2) of the visible capital in the heavenly kingdom, to come down to earth after the renovation of the world by fire
1c) the inhabitants of a city
Part of Speech: noun feminine
Citing in TDNT: 6:516, 906
Probably from the same as G4171, or perhaps from G4183; a town (properly with walls, of greater or less size): - city.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root Πόλις; click on the second column to search for that grammatical form of the root Πόλις; click on the third column to search for that word and grammatical form; click on the total to search for the root Πόλις.