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📄 '''Definition of occurrence''' is the policy language in a [[Definition:Liability insurance | liability insurance]] contract that specifies what constitutes a covered event triggering the insurer's obligation to pay — and it stands as one of the most frequently litigated and consequential provisions in [[Definition:Commercial general liability (CGL) | commercial general liability]] and other [[Definition:Occurrence-based policy | occurrence-based]] coverages. The standard [[Definition:Insurance Services Office (ISO) | ISO]] CGL form defines an occurrence as "an accident, including continuous or repeated exposure to substantially the same general harmful conditions," but this seemingly straightforward definition generates enormous complexity when applied to real-world scenarios involving [[Definition:Latent injury | latent injuries]], [[Definition:Environmental liability | environmental contamination]], [[Definition:Construction defect | construction defects]], or mass tort claims. How an occurrence is defined — and how courts interpret that definition — determines not only whether coverage exists but how many [[Definition:Policy limit | policy limits]] may be available across multiple policy periods.

⚙️ The central operational question the definition of occurrence answers is: does a given set of facts constitute one occurrence or multiple occurrences? The answer profoundly affects both the insured and the insurer. If a manufacturer's defective product injures 500 people, treating the production of the defective batch as a single occurrence means one [[Definition:Self-insured retention (SIR) | self-insured retention]] or [[Definition:Deductible | deductible]] applies but only one per-occurrence limit is available. Treating each injury as a separate occurrence multiplies both the retentions and the available limits. Courts have developed competing tests — the "cause" test, the "effect" test, and various hybrid approaches — and results vary by jurisdiction, creating significant uncertainty for carriers managing multi-state [[Definition:Claims | claims]] portfolios. [[Definition:Reinsurance | Reinsurers]] face the same aggregation question under their own treaties, where the definition of occurrence or "event" controls whether losses from a common cause are combined into a single recovery or treated separately, directly affecting [[Definition:Reinsurance recovery | recoveries]] under [[Definition:Excess of loss reinsurance | excess of loss]] covers.

💡 Getting the definition of occurrence right — in policy drafting, claims handling, and [[Definition:Reinsurance | reinsurance]] placement — carries enormous financial stakes. A single interpretive shift can move tens of millions of dollars between insureds, primary carriers, and reinsurers. This is why [[Definition:Underwriting | underwriters]], [[Definition:Claims counsel | claims counsel]], and [[Definition:Actuarial science | actuaries]] all invest significant attention in understanding how occurrence language interacts with emerging loss scenarios, from [[Definition:Cyber insurance | cyber]] events affecting thousands of policyholders through a single software vulnerability to opioid litigation spanning decades of alleged wrongful conduct. As new theories of liability evolve, the definition of occurrence will continue to be the fault line along which coverage disputes are fought and resolved.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Occurrence-based policy]]
* [[Definition:Claims-made policy]]
* [[Definition:Commercial general liability (CGL)]]
* [[Definition:Policy limit]]
* [[Definition:Aggregation]]
* [[Definition:Trigger of coverage]]
{{Div col end}}

Definition:Definition of occurrence - Revision history

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