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📝 '''Definition clause''' is the section of an [[Definition:Insurance policy | insurance policy]] or [[Definition:Reinsurance contract | reinsurance treaty]] that assigns precise, legally operative meanings to key terms used throughout the contract. Positioned near the front of the document, this clause establishes the vocabulary that governs how [[Definition:Coverage | coverage]] is interpreted — words like "insured," "loss," "occurrence," and "property" take on specific, bounded meanings that may diverge significantly from everyday usage. In insurance, where the difference between a covered and an uncovered event can turn on a single phrase, the definition clause is arguably the most consequential part of the contract.

🔧 Typically, every term given a special meaning in the definition clause is capitalized throughout the policy to signal to the reader that it carries a prescribed meaning rather than its common-language sense. [[Definition:Underwriter | Underwriters]], [[Definition:Insurance broker | brokers]], and legal counsel negotiate these definitions with care, especially for complex or emerging risks such as [[Definition:Cyber insurance | cyber]], [[Definition:Parametric insurance | parametric triggers]], or [[Definition:Climate risk | climate-related perils]] where standard language may not yet exist. A well-drafted definition clause reduces ambiguity, limits the scope for [[Definition:Claim | claims]] disputes, and ensures that both the [[Definition:Insurance carrier | carrier]] and the [[Definition:Policyholder | policyholder]] share a common understanding of the contract's boundaries.

⚖️ When litigation arises, courts routinely look first at the definition clause to resolve coverage disputes, applying the principle that clearly defined terms control over general interpretations. Poorly drafted or missing definitions are a frequent source of [[Definition:Coverage dispute | coverage disputes]], giving rise to the legal doctrine of contra proferentem — construing ambiguity against the insurer that drafted the policy. Industry bodies such as the [[Definition:Insurance Services Office (ISO) | ISO]] and the [[Definition:Lloyd's Market Association (LMA) | LMA]] publish standardized definition clauses in their model [[Definition:Policy form | policy forms]], promoting consistency and reducing friction across the market. For anyone reviewing or drafting insurance contracts, understanding the definition clause is not optional — it is the foundation on which the entire agreement rests.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Definition]]
* [[Definition:Policy wording]]
* [[Definition:Exclusion]]
* [[Definition:Insurance policy]]
* [[Definition:Endorsement]]
* [[Definition:Conditions (policy)]]
{{Div col end}}

Definition:Definition clause - Revision history

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