In European law. An officer who presided over the admiralitas or collegium ammiralitatis. Loce, de Jur. Mar. lib. 2, c. 2, § 1. In old English law. A high officer or magistrate that had the government of the king's navy, and the hearing of all causes belonging to the sea. Cowell. In the navy. Admiral is also the title of high naval officers; they are of various grades,—rear admiral, vice-admiral, admiral, admiral of the fleet, the latter being the highest