A form of life or disability insurance where a mortgagor insures a mortgage in the event of death or disability. The principal covered by mortgage insurance declines as the mortgage is amortized. Thus, mortgage insurance is a form of decreasing term insurance. For example, John purchased a home for $150,000 and obtained a $100,000 30-year mortgage to finance the purchase. He then obtained a $100,000 mortgage insurance policy with decreasing terms of coverage corresponding to the amortization rate.