This is the 141st most frequent Italian word.
settembre
"Settembre" means "September" in English, the ninth month of the year.
Here, 'settembre' is a proper noun and refers to the ninth month of the year, used as the subject of the sentence.
Settembre è il mese che segna l'inizio dell'autunno.
September is the month that marks the start of autumn.
'Settembre' is used as a temporal marker specifying when the action of starting school occurs.
A settembre, spesso inizia la scuola in Italia.
In September, school often starts in Italy.
In this sentence, 'settembre' symbolizes the seasonal and atmospheric feeling associated with the month.