MATE n.
he title, they are called, respectively, first mate, second mate, third mate, etc. In the navy, a subordinate officer or assistant; as, master's mate; surgeon's mate.
PAY CERPS n.
A staff corps in the United States navy, consisting of pay directors, pay inspectors, paymasters, passed assistant paymasters, and assistant paymasters, having relative rank from captain to ensign, respectively.