mag·is·te·ri·al 
(măj′ĭ-stîrē-əl)
(măj′ĭ-stîrē-əl)adj.
1.
a. Of, relating to, or characteristic of a master or teacher; authoritative: a magisterial account of the history of the English language.
b. Sedately dignified in appearance or manner: "She would appear on the porch and reign over the street in magisterial beauty" (Harper Lee).
2. Dogmatic; overbearing: expounded on official protocol in magisterial tones.
3. Of or relating to a magistrate or a magistrate's official functions.
[Late Latin magisteriālis, from magisterius, from Latin magister, master, teacher; see meg- in the Appendix of Indo-European roots.]
mag′is·teri·al·ly adv.