What is defined as a refund of part or all of a premium payment?

The term that is defined as a refund of part or all of a premium payment is "Rebate." In the context of insurance and premiums, a rebate represents a situation where the insurer returns a portion of the premiums paid to the policyholder. This can occur for various reasons, such as changes in policy terms, overpayment, or as an incentive for continued business.

Rebates can serve as a way to attract and retain customers by providing financial relief or adjustments based on their policy performance or other criteria set by the insurer. This reflects a commitment to customer satisfaction and can be beneficial for policyholders seeking value in their insurance products.

In contrast, the other terms listed do not align with this definition. A dividend generally refers to a distribution of profits to shareholders of a corporation or mutual insurance company, not specifically related to premium refunds. An adjustment might imply a correction of an amount rather than a refund, and a credit could denote an amount applied towards future premiums or bills rather than a refund of those already paid.