<p><strong>Noun</strong></p><ul><li>a student in a national service academy or private military school or on a training ship.</li><li>a student in training for service as a commissioned officer in the U.S. Army, Air Force, or Coast Guard.</li><li>Compare midshipman (def 1).</li><li>a trainee in a business or profession.</li><li>a younger son or brother.</li><li>the youngest son.</li><li>(formerly) a gentleman, usually a younger son, who entered the army to prepare for a subsequent commission.</li><li>Also called cadet blue: a grayish to strong blue color.</li><li>Also called cadet gray: a bluish-gray to purplish-blue color.</li><li>Slang: a pimp.</li></ul>