"Duomo (English: /ˈdwoʊmoʊ/, Italian: [ˈdwɔːmo]) is an Italian term for a church with the features of, or having been built to serve as, a cathedral, whether or not it currently plays this role. Monza Cathedral, for example, has never been a diocesan seat and is by definition not a cathedral. On the other hand, the city of Trevi no longer has a bishop, although it once did, and the erstwhile cathedral of Emilianus of Trevi is now a mere church. By contradistinction, the Italian word for a cathedral sensu stricto is cattedrale.
Many people refer to particular churches simply as il Duomo, the Duomo, without regard to the full proper name of the church." - (en.wikipedia.org 16.05.2021)
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