amortize

transitive verb | \ ˈa-mər-ˌtīz, ə-ˈmȯr- \ | amor·tize

1. a : to pay off (as a loan) gradually usually by periodic payments of principal and interest or payments to a sinking fund

   b : to gradually reduce the cost of (as an asset) especially for tax purposes by making periodic charges to income over a time span amortize the machinery over five years — see also depreciation — compare capitalize, deduct