casualty

noun, plural cas·u·al·ties.

1. Military.
   1. a member of the armed forces lost to service through death, wounds, sickness, capture, or because his or her whereabouts or condition cannot be determined.
   2. casualties,loss in numerical strength through any cause, as death, wounds, sickness, capture, or desertion.
2. one who is injured or killed in an accident: There were no casualties in the traffic accident.
3. any person, group, thing, etc., that is harmed or destroyed as a result of some act or event: Their house was a casualty of the fire.
4. a serious accident, especially one involving bodily injury or death.

noun plural -ties

1. a serviceman who is killed, wounded, captured, or missing as a result of enemy action
2. a person who is injured or killed in an accident
3. a hospital department in which victims of accidents, violence, etc, are treated
4. anything that is lost, damaged, or destroyed as the result of an accident, etc

n.

early 15c., “chance, accident; incidental charge,” from casual (adj.) on model of royalty, penalty, etc. Casuality had some currency 16c.-17c. but is now obsolete. Meaning “losses in numbers from a military or other troop” is from late 15c. Meaning “an individual killed, wounded, or lost in battle” is from 1844.