"Under the law of war, the term "civilian" is a person who is not a combatant and is not a member of the military. It is ...
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slightly different from a non-combatant, as some non-combatants are not civilians (for example, military chaplains attached to the belligerent party or military personnel serving with a neutral country). Under international law, civilians in the territories of a party to an armed conflict are entitled to certain privileges under the customary laws of war and international treaties such as the Fourth Geneva Convention. The privileges that they enjoy under international law depends on whether the conflict is an internal one (a civil war) or an international one." - (en.wikipedia.org 16.09.2019)