What does AD SECTAM mean?

AD SECTAM meaning in Law Dictionary

t the match of. Commonly abbreviated to ads. Found in entering and indexing the brands of situations, where it really is desired that the title of defendant should come very first. Thus, "B. adverts. A." shows that B. is defendant in an action brought by A., therefore the name so written could be an inversion for the even more typical kind "A. v. B."