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From The Collaborative International Dictionary of English v.0.48:
Attorn \At*torn"\, v. i. [OF. atorner, aturner, atourner, to direct, prepare, dispose, attorn (cf. OE. atornen to return, adorn); [`a] (L. ad) + torner to turn; cf. LL. attornare to commit business to another, to attorn; ad + tornare to turn, L. tornare to turn in a lathe, to round off. See Turn, v. t.] 1. (Feudal Law) To turn, or transfer homage and service, from one lord to another. This is the act of feudatories, vassals, or tenants, upon the alienation of the estate. --Blackstone. [1913 Webster] 2. (Modern Law) To agree to become tenant to one to whom reversion has been granted. [1913 Webster]