prīˈmāshəl adjective
Etymology: French, from Middle French, from Medieval Latin primatialis, from primatia primacy + Latin -alis -al — more at primacy
1. : of, relating to, or characteristic of a primate
was deprived of his primatial authority — F.M.Stenton
2. : having primacy : principal
the primatial city of ancient Ireland — W.G.Carleton