definition quarto
Freebase(0.00 / 0 votes)Rate this definition: Quarto, Campania. Quarto is a comune in the Province of Naples in the Italian region Campania, located about 11 km northwest of Naples. As of 31 December 2004, it had a population of 38,573 and an area of 14.2 kmÂ². Quarto borders the following municipalities: Giugliano in Campania, Marano di Napoli, Naples, Pozzuoli, Villaricca.