Who coined the term "(Non)Derogatory Matrices"?

Question

In a lecture, there was the question upcoming who coined the term "nonderogatory". I tried to search for it a bit, but the earliest I found so far was by Charles G. Cullen in 1990, which seems not likely.

So the question is:

Who coined/defined the term "Nonderogatory Matrices" / "Derogatory Matrices"?

Answer 1

According to this article by Nick Higham, Sylvester introduced the term derogatory matrix.

This other article also mentions Sylvester, namely an article he wrote in the french Comptes rendus de l'Académie des sciences (v.98, I (1884), pp. 471-475), which can be found on Gallica, here. It starts with:

Avant de considérer l'équation $xy=yx$, il importe d'avoir une idée nette d'une certaine classe de matrices que je nomme privilégiées ou dérogatoires, en tant qu'elles dérogent à la loi générale que toute matrice est assujettie à satisfaire à une équation identique dont le degré ne peut pas être moindre que l'ordre de la matrice.

A rough translation could be

Before considering the equation $xy=yx$, it's necessary to consider a certain class of matrices I call privileged or derogatory, in that they derogate from the general rule that a matrix satisfies an equation whose degree cannot be less than the order of the matrix.