A policy term under which the insurer generally cannot challenge the policy's validity for non-disclosure or misrepresentation once it has been in force during the life insured's lifetime for a stated period.
訂明保單在受保人在生期間生效滿指定期間後，保險人一般不得再以不披露或失實陳述為理由質疑其效力的保單條款。