n An unexpected event with negative consequences occurring without the intention of the one suffering the consequences.
n (context|philosophy|logic) A quality or attribute in distinction from the substance, as sweetness, softness.
n (context|legal) casus; such unforeseen, extraordinary, extraneous interference as is out of the range of ordinary calculation.
n (context|military) An unplanned event that results in injury (including death) or occupational illness to person(s) and/or damage to property, exclusive of injury and/or damage caused by action of an enemy or hostile force.