• a regular payment of money borrowed under such an agreement: a mortgage of £247 per month —vb 5. to pledge (a house or other property) as security for the repayment of a loan —adj 6. of or relating to a mortgage: a mortgage payment [C14 • Homethinking mortgage research allows you to easily see the market share of lenders in various areas and how exposed to the subprime mortgage crisis both the areas and lenders are.