Relating to or belonging to a demesne; characteristic of lands or estates held directly by a feudal lord.
From demesne + -ial (relating to). Created as an adjective form to describe things pertaining to a lord's personal holdings or domains.
This is a specialized adjective from medieval land law—scholars use 'demesnial lands' when they want to precisely indicate not just any feudal property, but specifically the lord's personal agricultural base.
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