The sum of all unearned premium for in force policies of insurance under the reinsurance agreement, often with respect to a particular block, book or class of business during a particular period.
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UK: an amount payable by a cedant to a reinsurer in consideration of the reinsurer accepting liability for all or part of the liability arising under a contract of reinsurance for claims occurring after a specified date under all or certain underlying contract incepting prior to that date.