In Roman antiquity, a provincial town, as distinguished from urbs, the city of Rome itself.(noun)
The Century Dictionary (Public Domain)
Use "oppidum" in a sentence
"Demetrius, the owner's brother, had bred and trained them -- four magnificent black Arabs -- and they excited much interest among the knowing judges who were wont to collect and lounge about the 'oppidum', as it was called, behind the 'carceres' -- [The covered sheds or stalls in which the horses were brought to wait for the start.] -- to inspect the racers, predict the winner, offer counsel to the drivers, and make bets."
"Quid toto terrarum orbe communius? quae civitas, quod oppidum, quae familia vacat amatorum exemplis?"
"How he hated to hear this one say that Athens outshone her as the sun does the moon, hear that one say that Pergamum on its heights was far lovelier, hear another say that Alexandria made her look like a Gallic oppidum!"