A variant or archaic spelling of demesne; land held in one's own hands or under one's direct control, especially a lord's personal estate.
From Old French demeine, from Latin dominicus (belonging to a lord). The spelling 'demesgne' is a Middle English variant reflecting Norman French pronunciation patterns before modern spelling standardized.
This spelling variant is a linguistic fossil—you can actually see the French pronunciation 'deyn' hiding in that weird 'sgne' ending, a ghost of how English scribes tried to capture unfamiliar sounds.
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