Discover Dec.02 p.82 "At the heart of a magisterial exhibit about Albert Einstein....."
I had to look up "magisterial".

magisterial
adj.
5ML magisterialis < LL magisterius < L magister, a MASTER6
1 of or suitable for a magistrate or master
2 authoritative; official
3 domineering; pompous
—SYN MASTERFUL
mag#is[te4ri[al[ly
adv.