2. To agree to become tenant to one to whom reversion has been granted.
Origin: 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.