apportionment
Apportionment involves the question of "how much" each of two or more policies covering a risk that sustained a loss will contribute to that loss.
Additional Information
In workers compensation insurance, it is the division of liability for an occupational illness among various entities. Usually, this means dividing it among a group of employers in whose employment the employee was exposed to the conditions that contributed to the illness. It can also mean division of liability between an employer and a fund, such as a second injury fund, that pays for the portion of a claim attributable to preexisting conditions.
