observer

a person who watches or listens to something carefully, especially in order to learn about it or report on it

observador, testigo

• an observer of sth

Collocations observer of events · observer at a meeting

• She was an observer at the peace talks.

  Ella fue observadora en las conversaciones de paz.

a person who is officially present to watch and report on an event or situation, especially in order to make sure that rules are followed

observador oficial, supervisor

• an observer of sth

Collocations observer at an election · international observers

• The election was monitored by international observers.

  La elección fue supervisada por observadores internacionales.