Cadet

noun

1. A student at a military school who is training to be an officer.
2. A younger or youngest son, who would not inherit as a firstborn son would.
3. (in compounds, chiefly in genealogy) Junior. (See also the heraldic term cadency.)

   "a cadet branch of the family"

4. A young man who makes a business of ruining girls to put them in brothels.
5. A young gentleman learning sheep farming at a station; also, any young man attached to a sheep station.