ATTORNMENT, in English real property law, the acknowl edgment of a new lord by the tenant on the alienation of land. Under the feudal system it was always considered unreason able to the tenant to subject him to a new lord without his own approval, and it thus came about that alienation could not take place without the consent of the tenant. Attornment was also extended to all cases of lessees for life or for years. The necessity for attornment was abolished by an act of 1705 (see now s. 151 of the Law of Property Act 1925). The term is now used to indicate an acknowledgment of the existence of the relationship of landlord and tenant. An attornment-clause, in mortgages, is a clause whereby the mortgagor attorns tenant to the mortgagee, thus giving the mortgagee the right to distrain, as an additional security.