/əbˈzɜ:və(r) ||; əbˈzɝvɚ/noun[C] 1 a person who watches sb/sth 观察者: According to observers, the plane exploded shortly after take-off. 据目击者说，那架飞机起飞不久就爆炸了。
2 a person who attends a meeting, lesson, etc to watch and listen but who does not take part （出席会议的）观察员；（到堂听课的）旁听生