noun
exclusion
In plain English
Something the policy specifically does not cover, listed in the policy form or added by endorsement.
Exclusions are how insurers carve out things they don't want to cover. War, intentional acts, professional services (on a GL), pollution, asbestos. Some are standard; some are added by endorsement at renewal — that's where to watch.
What it covers
Nothing — exclusions are the inverse of coverage. They define what the policy WON'T pay for.
What it does not cover
Don't confuse a coverage gap (something never in the policy) with an exclusion (something carved out). Both have the same practical effect but appear in different places on the form.
Where it trips people up
Renewal-time exclusion endorsements are the silent killer. The premium might not change. The form list adds CG 21 75 (silica exclusion) or similar — and a coverage you had last year is gone.
The technical version
A provision in an insurance policy or endorsement that eliminates coverage for certain specified perils, persons, property, locations, or hazards.