From Gregory Boop,
Your Guide to Business Insurance.
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Definition: An "additional insured" is a person or entity added to a business policy for purposes of coverage. This may be a temporary arrangement (contractor on a job adding the premises of the project until complete) or more permanent (tenant in a commercial building adding landlord).

Also Known As: named insured, additional named insured

Examples: By the terms of my lease, my landlord must be an additional insured on my property insurance.