Type of agreement in which only one of the parties is legally required to carry out the terms. Insurance contracts are unilateral because the insurance company promises benefits and only the insurer can be charged with breach of contract.
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A contract where only one of the parties makes a promise that is legally enforceable. An insurance contract qualifies as a unilateral contract because the insurer is the only one to make a promise.
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A contract such as an insurance policy in which only one party to the contract, the insurer, makes any enforceable promise. The insured does not make a promise but pays a premium, which constitutes his part of the consideration.