Question

what do you mean by adjoint?​

Answer 1

relating to or denoting a function or quantity related to a given function or quantity by a particular process of transposition.

Answer 2

In mathematics, the term adjoint applies in several situations. Several of these share a similar formalism: if A is adjoint to B, then there is typically some formula of the type (Ax, y) = (x, By). Specifically, adjoint or adjunction may mean: Adjoint of a linear map, also called its transpose.