In a manner relating to genealogy; from the perspective of family descent or ancestry.
Adverbial form created by adding '-ly' to 'genealogical'; the -ly suffix converts adjectives into adverbs in English, a pattern productive since Old English.
When historians say 'genealogically speaking,' they mean 'based on how families trace their connections'—the -ly ending lets us turn any adjective into an adverb.
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