Civilian (noun)

1. A person who is not in the military or police, especially one who is not involved in fighting in a war.
2. A person who is not a professional in a particular field, especially in the military or law enforcement.

Origin:

The word "civilian" comes from the latin word "civilis" meaning relating to a citizen. it was first used in english in the mid 17th century to describe a person not connected with the military.

Examples:

1. The injured civilians were taken to the hospital.
2. The civilian population was caught in the crossfire during the battle.
3. The scientist was a civilian expert in the field of renewable energy.
4. The civilian workforce was laid off as a result of budget cuts.
5. The civilian oversight board was created to monitor the actions of the police.