noun.
In reckoning the yield of a bond bought at a premium, the periodic subtraction from its current yield of a proportionate share of the premium between the purchase date and the maturity date.
The Century Dictionary and Cyclopedia
noun.
The act of alienating lands or tenements to a corporation in mortmain.
noun.
Extinction, as of debt, especially by a sinking-fund; a payment toward such extinction.
noun.
Also admortization, amortizement.
the GNU version of the Collaborative International Dictionary of English
noun.
The act or right of alienating lands to a corporation, which was considered formerly as transferring them to dead hands, or in mortmain.
noun.
The extinction of a debt, usually by means of a sinking fund; also, the money thus paid.