amor·tize /'a-mər-ˌtīz, ə-'mȯr-/ vt -tized, -tiz·ing: to reduce (an amount) gradually: as
a: to pay off (as a loan) gradually usu. by periodic payments of principal and interest or payments to a sinking fund
b: to gradually reduce the cost of (as an asset) esp. for tax purposes by making periodic charges to income over a time span
amor·ti·za·ble adj
amor·ti·za·tion /ˌa-mər-tə-'zā-shən, ə-ˌmȯr-/ n
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.