The Collaborative International Dictionary
Admortization
Admortization \Ad*mor`ti*za"tion\, n. [LL. admortizatio. Cf. Amortization.] (Law) The reducing or lands or tenements to mortmain. See Mortmain.
Wiktionary
admortization
n. (context legal English) In feudal law, the reducing of lands or tenements to mortmain.