At*torn"ment (&?;), n. [OF. attornement, LL. attornamentum. See Attorn.] (Law) The act of a feudatory, vassal, or tenant, by which he consents, upon the alienation of an estate, to receive a new lord or superior, and transfers to him his homage and service; the agreement of a tenant to acknowledge the purchaser of the estate as his landlord. Burrill. Blackstone.