observer
//əbˈzɜːrvər//
Noun
observerSingular
observersPlural
1
A person who watches or notices something, especially in an official or professional capacity.
UN observers were sent to monitor the election process.
2
A person who attends a meeting, event, or situation to watch and report but not to participate.
UN observers were present at the election to ensure fairness.
3
A person who follows or monitors a particular subject, situation, or field of interest closely.
She is a keen observer of political trends in Asia.