Meanings
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1
noun
a student or trainee preparing to become a military or police officer
The cadet spent the summer learning navigation and field discipline.
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2
noun
historical: a younger son or junior member of a noble family, especially one outside the main line of inheritance
As a cadet of the house, he inherited the family name but not the estate.
Thesaurus
Etymology
Borrowed from French cadet, from Gascon capdet, 'captain or younger son,' ultimately from Late Latin capitellum, 'little head.' The family sense referred to a younger son who would not inherit the main estate; because such sons often sought military careers, cadet became the standard term for an officer trainee.