1. a person who becomes aware (of things or events) through the senses

Similar word(s): beholder, perceiver, percipient

Definition categories: person, individual, mortal, somebody, someone, soul

2. an expert who observes and comments on something

Similar word(s): commentator

Definition categories: person, expert

Sentences with observer as a noun:

- Most impartial observers agreed that Sampras had not served well.

- I shall be an observer of the local customs.

- The UN sent many observers to the country's first elections.

- The only crew-member to survive the crash was the Canadian observer.

- We waited till dusk when the observers' vision was poorest.