attorneyn.[OE. aturneye, OF. atorn, p. p. of atorner: cf. LL. atturnatus, attornatus, fr. attornare. See Attorn.]1. A substitute; a proxy; an agent.()And will have no attorney but myself. (Shak.)2. (Law) One who is legally appointed by another to transact any business for him; an attorney in fact.()()A power, letter, or warrant, of attorney, a written authority from one person empowering another to transact business for him.()v. t. To perform by proxy; to employ as a proxy.(Shak.)