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