medieval

mastery
UK /ˌmɛd.iˈiː.vəl/ US /mɪdˈi.vəl/adjnoun

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Which word is closest in meaning to 'medieval' in this sentence?

The book significantly extends on Rosenstein’s monumental 1990 work, which focused on the genealogies of the major Ashkenazi rabbinic dynasties from medieval times to the present.