In genealogy

Genealogy

Genealogy is the study of families and the tracing of their lineages and history. Genealogists use oral traditions, historical records, genetic analysis, and other records to obtain information about a family and to demonstrate kinship and pedigrees of its members...

, a cadet is a younger son

Son

A son is a male offspring; a boy or man in relation to his parents. The female analogue is a daughter.-Social issues regarding sons:In pre-industrial societies and some current countries with agriculture-based economies, a higher value was, and still is, assigned to sons rather than daughters,...

, as opposed to the firstborn heir. Compare puisne

Puisne

Puisne is a legal term of art used mainly in British English meaning "inferior in rank." It is pronounced like the word puny, and the word, so spelled, has become an ordinary adjective meaning weak or undersized.The judges and barons of the common law courts at...

.

Etymology

The word is recorded in English

English language

English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

 since 1634, originally for a young son, identical to the French

French language

French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...

, which is itself derived from the gascon

Gascon language

Gascon is usually considered as a dialect of Occitan, even though some specialists regularly consider it a separate language. Gascon is mostly spoken in Gascony and Béarn in southwestern France and in the Aran Valley of Spain...

 Occitan (spoken in Gascony

Gascony

Gascony is an area of southwest France that was part of the "Province of Guyenne and Gascony" prior to the French Revolution. The region is vaguely defined and the distinction between Guyenne and Gascony is unclear; sometimes they are considered to overlap, and sometimes Gascony is considered a...

 in southwest France) capdet "captain, chief", in turn from the Late Latin

Late Latin

Late Latin is the scholarly name for the written Latin of Late Antiquity. The English dictionary definition of Late Latin dates this period from the 3rd to the 6th centuries AD extending in Spain to the 7th. This somewhat ambiguously defined period fits between Classical Latin and Medieval Latin...

 capitellum, the diminutive of Latin caput "head" (hence also chief).

Younger sons from Gascon families apparently were commonly sent to the French court to serve as officers; as a rule non-heirs from the European nobility sought careers in the military or the clergy.

Usage

As an adjective, "cadet" is used to signify a junior branch of a family. Thus, the Orléans

House of Orleans

Orléans is the name used by several branches of the Royal House of France, all descended in the legitimate male line from the dynasty's founder, Hugh Capet. It became a tradition during France's ancien régime for the duchy of Orléans to be granted as an appanage to a younger son of the king...

 line was a cadet branch

Cadet branch

Cadet branch is a term in genealogy to describe the lineage of the descendants of the younger sons of a monarch or patriarch. In the ruling dynasties and noble families of much of Europe and Asia, the family's major assets – titles, realms, fiefs, property and income – have...

of the Bourbon

House of Bourbon

The House of Bourbon is a European royal house, a branch of the Capetian dynasty . Bourbon kings first ruled Navarre and France in the 16th century. By the 18th century, members of the Bourbon dynasty also held thrones in Spain, Naples, Sicily, and Parma...

 family.
For the status as such, the noun cadency

Cadency

In heraldry, cadency is any systematic way of distinguishing similar coats of arms belonging to members of the same family. Cadency is necessary in heraldic systems in which a given design may be owned by only one person at once...

 exists, as in the heraldic

Heraldry

Heraldry is the profession, study, or art of creating, granting, and blazoning arms and ruling on questions of rank or protocol, as exercised by an officer of arms. Heraldry comes from Anglo-Norman herald, from the Germanic compound harja-waldaz, "army commander"...

 term mark of cadency for a feature which distinguishes a cadet son's coat of arms

Coat of arms

A coat of arms is a unique heraldic design on a shield or escutcheon or on a surcoat or tabard used to cover and protect armour and to identify the wearer. Thus the term is often stated as "coat-armour", because it was anciently displayed on the front of a coat of cloth...

 from the father's which is passed on unaltered only to the (usually firstborn) heir.

Military has been the traditional career choice of the nobility throughout the centuries, and it has been customary that the firstborn son has inherited the title, lands and possessions, while the younger sons of a noble family went to military, often to be trained as officers. Hence the meaning "cadet branch

Cadet branch

Cadet branch is a term in genealogy to describe the lineage of the descendants of the younger sons of a monarch or patriarch. In the ruling dynasties and noble families of much of Europe and Asia, the family's major assets – titles, realms, fiefs, property and income – have...

" for a junior branch of a family and the term "cadet

Cadet

A cadet is a trainee to become an officer in the military, often a person who is a junior trainee. The term comes from the term "cadet" for younger sons of a noble family.- Military context :...

" for an officer trainee.