This is the 520th most frequent Italian word.
avvenuto
"Avvenuto" means "occurred" or "happened" in English.
Here, 'avvenuto' is the past participle of the verb 'avvenire', used to indicate that an event took place in the past.
L'incidente è avvenuto ieri sera.
The accident occurred last night.
In this case, 'avvenuto' describes the way a change happened, indicating a process over time.
Questo cambiamento è avvenuto gradualmente.
This change occurred gradually.
Here, 'avvenuto' is used in a conditional clause to denote the hypothetical occurrence of an event.