noun

• Something that happens by chance, especially an unfortunate event; an accident, a disaster.
• A person suffering from injuries or who has been killed due to an accident or through an act of violence.
• (proscribed) Specifically, a person who has been killed (not only injured) due to an accident or through an act of violence; a fatality.
• (military) A person in military service who becomes unavailable for duty, for any reason (notably death, injury, illness, capture, or desertion).
• (Britain) The accident and emergency department of a hospital providing immediate treatment; a casualty department or emergency room.
• An incidental charge or payment.
• Someone or something adversely affected by a decision, event or situation.
• (obsolete) Chance nature; randomness.