1) There were many cities by this name, - in Armenia, Pontus, Cilicia, Epirus, Thrace - which were generally built or had there name changed, by some conqueror to commemorate a victory. The one in Tit 3:12 seems to refer to the city was built by Augustus in memory of the battle of Actium on a promontory of Epirius. The one in the subscription of Titus seems to refer to Thracian Nicopolis, founded by Trojan on the river Nestus, since he calls it the city of Macedonia.
Part of Speech: noun proper locative
From G3534 and G4172; victorious city; Nicopolis, a place in Macedonia: - Nicopolis.
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 Νικόπολις; click on the second column to search for that grammatical form of the root Νικόπολις; click on the third column to search for that word and grammatical form; click on the total to search for the root Νικόπολις.