Pronunciation: (maj"u-stēr'ē-ul),[key] —adj. 1. of, pertaining to, or befitting a master; authoritative; weighty; of importance or consequence: a magisterial pronouncement by the director of the board. 2. imperious; domineering: a magisterial tone of command. 3. of or befitting a magistrate or the office of a magistrate: The judge spoke with magisterial gravity. 4. of the rank of a magistrate: magisterial standing.