1.Definition: of or relating to a magistrate

"Official magisterial functions"

2.Definition: offensively self-assured or given to exercising usually unwarranted power

"Managed the employees in an aloof magisterial way"

Related Adjective(s):autocratic, bossy, dominating, peremptory

3.Definition: used of a person's appearance or behavior; befitting an eminent person

"She reigned in magisterial beauty"

Related Adjective(s):distinguished, grand, imposing