Meaning of “casualty” - Learner’s Dictionary

casualty

noun uk us /ˈkæʒjuəlti/
INJURED [ C ]

someone who is injured or killed in an accident or war:

Both sides in the conflict have promised to try to avoid civilian casualties.
BADLY AFFECTED [ C ]

someone or something that is badly affected by something that happens:

The health service has been the biggest casualty of government cuts.
HOSPITAL [ U ] UK (US emergency room)

the part of a hospital where people go when they have been injured or have illnesses so that they can be treated immediately

(Definition of “casualty” from the Cambridge Learner’s Dictionary © Cambridge University Press)