Relating to or characteristic of a feudatory; pertaining to feudal tenure or those who hold feudal estates.
From feudatory plus -ial suffix meaning 'relating to.' This adjective form is quite rare, used primarily in historical and legal contexts to describe feudal relationships.
This is the kind of ultra-specialized historical term that appears in 300-year-old legal documents—it's so specific that even medieval lawyers might have preferred 'feudal' or 'feudatory' in everyday speech.
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