What is the meaning of Adjoint?

Used in certain contexts, in each case involving a pair of transformations, one of which is, or is analogous to, conjugation (either inner automorphism or complex conjugation).

That is related to another functor by an adjunction.

Having a relationship of the nature of an adjoint (adjoint curve); sharing multiple points with.

The transpose of the cofactor matrix of a given square matrix.

Transpose conjugate.

Hermitian conjugate.

A functor related to another functor by an adjunction.

A curve A such that any point of a given curve C of multiplicity r has multiplicity at least r–1 on A. Sometimes the multiple points of C are required to be ordinary, and if this condition is not satisfied the term sub-adjoint is used.

An assistant to someone who holds a position in the military or civil service.

An assistant mayor of a French commune.

deputy, assistant

adjunct

past participle of adjoindre

Source: wiktionary.org