Midshipman

n.	1.	Formerly, a kind of naval cadet, in a ship of war, whose business was to carry orders, messages, reports, etc., between the officers of the quarter-deck and those of the forecastle, and render other services as required.
	2.	(Zool.) An American marine fish of the genus Porichthys, allied to the toadfish; also called singingfish. Cadet midshipman formerly a title distinguishing a cadet line officer from a cadet engineer at the U. S. Naval Academy. See under Cadet. formerly, a naval cadet who had served his time, passed his examinations, and was awaiting promotion; - now called, in the United States, midshipman; in England, sublieutenant.

Noun

1.

midshipman - a temporary rank held by young naval officers in training

Naval Reservist, Royal Marine, Seabee, bluejacket, boot, cadet, freshman, frogman, gob, horse marine, jolly, junior, marine, midshipmite, naval cadet, navy man, plebe, senior, soph, sophomore, swabbie, undergrad, undergraduate, upperclassman