observer
US /əbˈzɝː.vɚ/
UK /əbˈzɝː.vɚ/

1.
2.
osservatore
a person who attends a meeting or event without participating in it
:
•
She attended the conference as an observer, not a speaker.
Ha partecipato alla conferenza come osservatore, non come relatore.
•
International observers were present during the elections.
Osservatori internazionali erano presenti durante le elezioni.