Definition: The word "coinsurance" in English can refer to two different meanings, depending on the context: 1. Insurance coverage provided by a third party: Coinsurance refers to the agreement between an insurer (usually the one providing the insurance) and another party (the policyholder) to share a risk or responsibility for the payment of premiums for both the insured's and the other party's benefits from the same insurance policy. The concept of coinsurance is often used in the context of group health plans, where each member pays part of their premium to cover the costs of other members who are not covered by the plan. 2. A form of liability protection: Coinsurance can also refer to a type of legal contract that requires both parties involved (the insurer and the policyholder) to agree upon certain conditions regarding the payment of claims, such as medical expenses or injury. This concept is often used in legal contexts where it is necessary to cover costs incurred by an individual or entity due to a specific event. Both terms can be used interchangeably when referring to a situation where one party provides insurance coverage for the benefit or risk of another party. The specific meaning and context of coinsurance will depend on the laws and regulations in place, as well as the specific insurance policies involved.