Adjoint
/ˈædʒɔɪnt/noun
A thing or person joined to another; in mathematics, a related operator or matrix derived from another.
Did you know?Adjoint comes from Latin *adiungere*, meaning “to join to,” the same ancient root behind words of union, addition, and junction — a reminder that language itself is built by binding pieces together.
Etymological Timeline
Latin
Latin
adiungere
“to join to, attach, add”
Late Latin
Latin
adiunctus
“joined to, added, attached”
Old French
Old French
ajoint
“joined, adjacent”
Middle English
English
adjoint
“joined to, attached; in logic and law, associated”
Modern English
English
adjoint
“joined to another; a related mathematical operator”