Webster's Revised Unabridged Dictionary · 1913

Magisterial

Magisterial , adjective

[Latin magisterius magisterial. See Master.]

1.
Of or pertaining to a master or magistrate, or one in authority; having the manner of a magister; official; commanding; authoritative. Hence: Overbearing; dictatorial; dogmatic.
When magisterial duties from his home Her father called. — Glover
We are not magisterial in opinions, nor, dictator-like, obtrude our notions on any man. — Sir T. Browne
Pretenses go a great way with men that take fair words and magisterial looks for current payment. — L'Estrange
2.
(Alchem. & Old Chemistry) Pertaining to, produced by, or of the nature of, magistery. See Magistery, 2.