|majə|stirēəlē, -li adverb
1.
a. : with an authoritative manner because of knowledge and experience : masterfully
could assert that light is corpuscular … so magisterially that astronomical expeditions could be organized — Alvin Johnson
b. : with a lordly air : dictatorially
it will not do to say magisterially , “Take the child away!” — J.L.Lowes
2. : in the position or with the authority of a magistrate