# Meaning of adjoint in English:

Mathematics
• 1Relating 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.’
• ‘For the case of a finite-dimensional real linear space these are infinite systems whose adjoint cone is topologically closed.’
• ‘Suffice it to say that adjoint functors pervade mathematics and this pervasiveness is certainly one of the most mysterious fact that category theory reveals about mathematics and probably thinking in general.’
1. 1.1Denoting a matrix that is the transpose of the complex conjugates or the cofactors of a given square matrix.

### noun

Mathematics
• An adjoint matrix, function, or quantity.

‘He reproved the earlier results and gave new results of his own on minors and adjoints.’
• ‘The Smoluchowski diffusion equation, represented as the eigenvalue equation for the adjoint of the diffusion operator, has been solved by computing averages obtained along with the MD statistics.’

### Origin

Late 16th century (in sense ‘something joined or connected to something else’): from French, literally ‘joined to’, from adjoindre (see adjoin).