#1 folio n. [pagination, page number, paging] the system of numbering pages. wn
#2 folio n. [leaf] a sheet of any written or printed material (especially in a manuscript or book). wn
#3 folio n. a book (or manuscript) consisting of large sheets of paper folded in the middle to make two leaves or four pages; "the first folio of Shakespeare's plays". wn
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