Dictionary
mort•main
Pronunciation: (môrt'mān"), [key]—
n. Law.
1. the condition of lands or tenements held without right of alienation, as by an ecclesiastical corporation; inalienable ownership.
2. the perpetual holding of land, esp. by a corporation or charitable trust.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.