1. (n.) The younger of two brothers; a younger brother or son; the youngest son.

2. (n.) A gentleman who carries arms in a regiment, as a volunteer, with a view of acquiring military skill and obtaining a commission.

3. (n.) A young man in training for military or naval service; esp. a pupil in a military or naval school, as at West Point, Annapolis, or Woolwich.

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