cadet

1. (chiefly history) A younger or youngest son, who would not inherit as a firstborn son would.Examples: "Bertram is certainly well off for a cadet of even a Baronet's family. By the time he is four or five and twenty he will have seven hundred a year, and nothing to do for it."

2. (in compounds, chiefly in genealogy) Junior. (See also the heraldic term cadency.)Examples: "a cadet branch of the family"

3. (archaic, US, slang) A young man who makes a business of ruining girls to put them in brothels.

4. (New Zealand, historical) A young gentleman learning sheep farming at a station; also, any young man attached to a sheep station.

5. (Australia) A participant in a cadetship.