This is the 311th most frequent Italian word.
aperto
"Open."
Here, 'aperto' is used as a past participle functioning as an adjective, indicating the state of being open.
Il negozio è aperto dalle 9:00 alle 18:00.
The shop is open from 9:00 AM to 6:00 PM.
In this sentence, 'aperto' is the past participle of the verb 'aprire' and is used in a compound tense to describe the action performed.
Ho aperto la finestra per far entrare un po' d'aria fresca.
I opened the window to let in some fresh air.
The usage of 'aperto' here is adjectival, metaphorically describing the nature of the dialogue as unrestricted or candid.