[O008]

occurrence
1) In a non-insurance sense, an incident, event or happening. In insurance, the term may be defined as continual, gradual or repeated exposure to an adverse condition, which is neither intended nor expected to result in injury or damage as contrasted with an accident, which is a sudden happening. In reinsurance, per-occurrence coverage permits all losses arising out of one event to be aggregated instead of being handled on a risk-by-risk basis.

2) One basis or determinant for calculating the amount of loss or liability in insurance or reinsurance when an aggregation of related losses is to constitute a single subject of recovery. For example, in property catastrophe reinsurance treaties, occurrence is usually defined so that all losses within a specified period of time involving a particular peril are deemed an occurrence.