/ ˌmædʒɪˈstɪəriəl; NAmE -ˈstɪr-/ 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.
2.
( of a book or piece of writing ) showing great knowledge or understanding
SYN authoritative :
his magisterial work 'The Roman Wall in Scotland'
3.
[ only before noun ] connected with a magistrate
► magis·teri·al·ly / -iəli; NAmE / adverb
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WORD ORIGIN
early 17th cent.: from medieval Latin magisterialis , from late Latin magisterius , from Latin magister master.