What is Advice?

Legal Definition
Practice. The opinion given by counsel to their clients; this should never be done but upon mature deliberation to the best of the counsel's ability; and without regard to the consideration whether it will affect the client favorably or unfavorably.
-- Bouviers Law Dictionary
Legal Definition
Com. law. A letter containing information of any circumstances unknown to the person to whom it is written; when goods are forwarded by sea or land, the letter transmited to inform the consignee of the fact, is termed advice of goods, or letter of advice. When one merchant draws upon another, he generally advises him of the fact. These letters are intended to give notice of the facts they contain.
-- Bouviers Law Dictionary
Legal Definition
View; opinion; the counsel given by lawyers to their clients; an opinion expressed as to wisdom of future conduct The instruction usually given by one merchant or banker to another by letter, informing him of shipments made to him, or of blils or drafts drawn on him, with particulars of date, or sight, the sum, and the payee. Bills presented for acceptance or payment are frequently dishonored tov want of advice. See Letter of advice.
-- Black's Law Dictionary