N.Y. Comp. Codes R. & Regs. tit. 16, § 560.1
(4) Amortization means the gradual extinguishment of an amount in an account by distributing such amount over a fixed period, over the life of the asset or liability to which it applies, or over the period during which it is anticipated the benefit will be realized.
(5)
(a) When used in this system of accounts: