1.kaupunki Arizonan osavaltiossa noin 100 kilometriä Meksikon rajasta pohjoiseen ja lähes 200 kilometriä Phoenixista kaakkoonTucson on Arizonan toiseksi suurin kaupunki.
1.a city in southeastern Arizona ringed by mountain ranges; long known as a winter and health resort but the population shift from industrial states to the Sunbelt resulted in rapid growth late in the 20th century