Privy Council, is theoretically a council associated with the sovereign to advise him in matters of government. As at present constituted it includes the members of the royal family, the Cabinet, the two archbishops and the bishop of London, the principal English and Scotch judges, some of the chief ambassadors and governors of colonies, the Commander-in-Chief, the First Lord of the Admiralty, &c. No members attend except those summoned, usually the Cabinet, the officers of the Household, and the Primate. The functions of the Privy Council may be grouped as: (1) executive, in which its duties are discharged by the Cabinet, which is technically a committee of the Privy Council; (2) administrative—the Board of Trade, the Local Government Board, and the Board of Agriculture originated in committees; the Education Department is still a committee, and the Council retains such branches as the supervision of medical, pharmaceutical, and veterinary practice, the granting of municipal charters, &c.; (3) judicial—the Judicial Committee is a court of law, whose principal function is the hearing of appeals from ecclesiastical courts and from Indian and colonial courts.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Privateer * Privy Seal