Chambers's Twentieth Century Dictionary
L. magisterius—magister, a master—mag, root of L. magnus, great.
Your magisterium now, What's that?
"The Alchemist" by Ben Jonson
Maybe the Magisterium is at work.
Each text has generated various interpretive communities: " the faithful " and "we the people," academic scholars in theology and law, pastors and lawyers, and the magisterium and the Supreme Court.