magisterial adj. + Add to list US //ˌmædʒɪˈstiɹiəɫ// UK //mˌædʒɪstˈiəɹɪəl// mag·is·te·ri·al SynonymsEtymology Synonyms autocraticbossydistinguisheddominatinggrandhigh and mightyimposingperemptoryOrigin From Late Latin magisterialis, from Latin magisterium.