This is the 326th most frequent Italian word.
comune
"Comune" in Italian means "common" or refers to a "municipality" (a local administrative division).
Here, 'comune' is used as an adjective that describes 'problema,' meaning 'problem,' to indicate something frequent or ordinary.
Questo è un problema molto comune.
This is a very common problem.
In this case, 'comune' is employed as a noun to refer to an administrative division or municipality.
Abitano in un comune vicino a Roma.
They live in a municipality near Rome.
Here, 'comune' is used idiomatically to mean 'in common,' referring to shared attributes or objectives.