definition of
folio

[1] #1 folio n. [pagination, page number, paging] the system of numbering pages. wn

[2] #2 folio n. [leaf] a sheet of any written or printed material (especially in a manuscript or book). wn

[3] #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