adjective

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

He then went on to consider the case where the kernel is not symmetric and showed that in that case the eigenfunctions associated with a given eigenvalue occurred in adjoint pairs.

noun

An adjoint matrix, function, or quantity.

He reproved the earlier results and gave new results of his own on minors and adjoints.