ca·su·al·ty /'ka-zhəl-tē, 'ka-zhə-wəl-/ n pl -ties
1: an unfortunate occurrence; esp: a serious and often disastrous accident
conversion of property...arising from fire, storm, shipwreck, or other casualty — Internal Revenue Code
2: something lost, stolen, damaged, or destroyed see also casualty gain at gain; casualty loss at loss
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.