An insured has two or more policies on the same property that do not have identical terms and conditions. Such an arrangement could result in coverage gaps or disputed payments. This arrangement would be called

Liberalization is a clause in insurance policies that allows for changes in coverage without additional premium charges when the insurer adopts new or improved coverage. It does not pertain to the situation of having multiple policies with differing terms on the same property, which is the essence of nonconcurrency.

Assignment refers to the transfer of rights or benefits under an insurance policy from one party to another. This term does not relate to the issue of having multiple insurance policies with different terms covering the same property, which is characterized by nonconcurrency.

Subrogation is the process by which an insurance company seeks reimbursement from a third party that caused a loss after it has paid a claim to the insured. While it is a fundamental principle in insurance, it does not address the complications arising from having multiple policies with differing terms on the same property.