Definition of observer : one that observes : such as. a : a representative sent to observe but not participate officially in an activity (such as a meeting or war) b : an expert analyst and commentator in a particular field political observers.
Definition of observer : one that observes : such as. a : a representative sent to observe but not participate officially in an activity (such as a meeting or war) b : an expert analyst and commentator in a particular field political observers.