CADET Meaning of CADET in English n. 1 a young trainee in the armed services or police force. 2 NZ an apprentice in sheep-farming. 3 a younger son. cadetship n.[ F f. Gascon dial. capdet, ult. f. L caput head ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012