In a manner relating to or according to the methods of bibliography; concerning the study and description of books.
From bibliographical + -ly (adverbial suffix). Follows standard English patterns for converting adjectives to adverbs, first appearing in scholarly texts in the early 19th century.
When scholars say something is 'bibliographically significant,' they mean the physical object itself—not just the words—tells us something important about history, like how rare first editions can prove when a discovery really happened.
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