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📋 '''Occurrence definition''' refers to the contractual language in an [[Definition:Insurance policy | insurance policy]] or [[Definition:Reinsurance | reinsurance]] agreement that establishes what constitutes a single "occurrence" or "event" for the purpose of triggering coverage, applying [[Definition:Deductible | deductibles]], and calculating [[Definition:Policy limit | policy limits]]. In both primary insurance and reinsurance, the way an occurrence is defined can dramatically affect how multiple related losses are aggregated or separated — a distinction that often determines the financial outcome of a [[Definition:Claim | claim]] for all parties involved.

⚙️ Contracts typically define an occurrence as one event or a series of related events arising from a single cause or set of circumstances. The precise formulation matters enormously. A natural catastrophe, for instance, might produce thousands of individual property claims; whether those claims constitute one occurrence or many depends on the policy language and often on the applicable [[Definition:Hours clause | hours clause]] in catastrophe [[Definition:Excess of loss reinsurance | excess of loss]] treaties, which aggregates losses within a specified time window. In [[Definition:Liability insurance | liability insurance]], courts and arbitration panels across the United States, the United Kingdom, and other jurisdictions have reached conflicting conclusions on whether continuous pollution exposure, a series of defective products, or repeated professional errors amount to one occurrence or multiple occurrences. Reinsurance contracts frequently include specific "definition of event" or "loss occurrence" clauses — sometimes referencing recognized catastrophe modeling standards — to reduce ambiguity and align expectations between [[Definition:Ceding company | cedent]] and [[Definition:Reinsurer | reinsurer]].

🔍 Getting the occurrence definition right is one of the most consequential drafting exercises in insurance. When a [[Definition:Per occurrence deductible | per occurrence deductible]] or a [[Definition:Per occurrence excess of loss | per occurrence excess of loss]] layer is at stake, the financial difference between treating a string of losses as one occurrence versus several can run into hundreds of millions of dollars. Disputes over occurrence definitions have generated landmark litigation — including decisions in asbestos, environmental liability, and terrorism cases — that continue to shape policy language globally. Underwriters, [[Definition:Claims adjuster | claims professionals]], and legal teams devote significant attention to this clause because its interpretation ripples through [[Definition:Loss reserving | reserving]], [[Definition:Reinsurance recovery | reinsurance recoveries]], and [[Definition:Regulatory capital | capital adequacy]] calculations alike.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Occurrence-based coverage]]
* [[Definition:Hours clause]]
* [[Definition:Per occurrence deductible]]
* [[Definition:Per occurrence excess of loss]]
* [[Definition:Aggregation clause]]
* [[Definition:Claims-made coverage]]
{{Div col end}}

Definition:Occurrence definition - Revision history

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