- ma|gis|te|ri|al [ˌmædʒıˈstıəriəl US -ˈstır-] adj[Date: 1600-1700; : Late Latin; Origin: magisterialis, from Latin magister; MAGISTRATE]1.) a magisterial way of behaving or speaking shows that you think you have authority▪ his magisterial voice2.) a magisterial book is written by someone who has very great knowledge about a subject▪ his magisterial study of the First World War3.) [only before noun]connected with or done by a magistrate>magisterially adv
Dictionary of contemporary English. 2013.