flyleaf
US /ˈflaɪ.liːf/
UK /ˈflaɪ.liːf/
1.
a blank page at the beginning or end of a book, typically between the endpaper and the first or last page of the text.
:
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The author signed her name on the flyleaf of the book.
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He wrote a dedication on the flyleaf before gifting the book.