A casualty in military usage is a person in military service, who becomes unavailable for duty due to death or injury.[1] It also includes illness, capture, desertion, etc.; or a civilian casualty.

In civilian usage the word "casualty" is properly used for a person who is killed, wounded or injured by some event.[2] It is usually used to describe multiple deaths and injuries due to violent incidents or disasters. Casualties is sometimes loosely used to mean fatalities, but non-fatal injuries are also casualties.[3]

Reference

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