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observer

ob·serv·er [ əb zúrvər ] (plural ob·serv·ers)


noun 
Definition:
 
1. somebody who sees or watches something: somebody who observes something that is happening

2. nonparticipating witness: somebody who acts as a witness to an event, often officially and at the invitation of the participants

3. somebody observing ceremony or obeying law: somebody who duly celebrates a religious ceremony or ritual, or complies with a rule or law

4. air force aircraft identifier: somebody trained in identifying aircraft

5. military watcher of enemy movements: a soldier who watches enemy movements or directs artillery fire

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