magisterial

Universal Words adjective (formal) 1 (especially of a person or their behaviour) having or showing power or authority: He talked with the magisterial authority of the head of the family. * a magisterial forehead 2 (of a book or piece of writing) showing great knowledge or understanding: his magisterial work 'The Roman Wall in Scotland' 3 [onlybeforenoun] connected with a magistrate magisterially adverb