n. In Great Britain: The office and jurisdiction of the lords commissioners appointed to take the general management of maritime affairs, and of all matters relating to the royal navy, with the government of its various departments.n. The body of officers appointed to execute the office of lord high admiral; a board of commissioners, called lords (or, in full, lords commissioners) of the admiralty, for the administration of naval affairs.n. The building in which the lords of the admiralty transact business, and in which the clerks and other officials connected with this department are employed.n. That branch of law which deals with maritime cases and offenses.n.