n.

1. （军队的）伤亡人员[P1]
   Our regiment suffered heavy casualties.

   我团伤亡惨重。

2. （事故、灾难等的）死者；伤者；受害人[C]
   There were dozens of casualties in the train crash.

   在那次火车撞车事故中有数十人伤亡。

3. 意外事故，不幸事故[C]
   casualty insurance

   意外事故保险

4. （医院中的）急诊室[U]

n.

1. a person killed or injured in a war or accident.
   ▸Brit. the casualty department of a hospital.
2. (chiefly in insurance) an accident, mishap, or disaster.