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Amortization (or amortisation) is the process of decreasing, or accounting for, an amount over a period. The word comes from Middle English amortisen to kill, alienate in mortmain, from Anglo-French amorteser, alteration of amortir, from Vulgar Latin admortire to kill, from Latin ad- + mort-, mors death.
1. The paying off of debt in regular installments over a period of time.
2. The deduction of capital expenses over a specific period of time (usually over the asset's life). More specifically, this method measures the consumption of the value of intangible assets, such as a patent or a copyright.