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📋 '''Event definition''' is the contractual language within a [[Definition:Reinsurance | reinsurance]] agreement — and sometimes a primary [[Definition:Insurance policy | insurance policy]] — that specifies what constitutes a single [[Definition:Loss event | loss event]] or [[Definition:Occurrence | occurrence]] for the purpose of aggregating [[Definition:Claims | claims]] and triggering coverage. In [[Definition:Catastrophe reinsurance | catastrophe reinsurance]], for example, the event definition determines whether losses from a hurricane that strikes multiple states over several days are treated as one event or multiple, a distinction that can shift hundreds of millions of dollars in liability between the [[Definition:Cedent | cedent]] and the [[Definition:Reinsurer | reinsurer]].

🔍 The precise wording typically includes temporal and geographic parameters — often called "hours clauses" — that set boundaries around the qualifying window. A standard hours clause might stipulate that all losses arising from a single atmospheric disturbance within a 168-hour period and within a defined geographic zone constitute one event. Other formulations use a "cause" or "proximate cause" test, tying the definition to a single originating peril rather than time and place. These details are negotiated during [[Definition:Treaty reinsurance | treaty]] placement and are often among the most heavily debated provisions, since ambiguity can lead to contentious post-loss disputes. [[Definition:Lloyd's syndicate | Lloyd's syndicates]] and major reinsurers maintain dedicated wording teams to ensure event definitions align with their risk appetite and [[Definition:Retrocession | retrocession]] protections.

⚡ The stakes surrounding event definition became starkly visible after the September 11 attacks, when the question of whether the destruction of the two World Trade Center towers constituted one event or two resulted in landmark litigation and billions of dollars in contested coverage. Similar debates arise after complex catastrophes involving multiple perils — such as a hurricane followed by flooding and a storm surge — where the boundaries of a single event are far from obvious. For [[Definition:Insurtech | insurtech]] firms developing [[Definition:Catastrophe modeling | catastrophe models]] and automated claims aggregation tools, encoding robust event definitions into software logic is essential for producing accurate [[Definition:Loss estimate | loss estimates]] and supporting real-time portfolio management.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Occurrence]]
* [[Definition:Hours clause]]
* [[Definition:Catastrophe reinsurance]]
* [[Definition:Aggregation]]
* [[Definition:Loss event]]
* [[Definition:Proximate cause]]
{{Div col end}}

Definition:Event definition - Revision history

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