1. 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"
    
2. A sheet of any written or printed material (especially in a manuscript or book)
   "The folio contained beautiful illuminations";
   - leaf
    
3. A reference to a specific page in a book, manuscript, or document, often used for navigation or citation
   "The librarian asked for the folio to locate the passage";
   - page number

Derived forms: folios

Type of: book, piece of paper, sheet, sheet of paper, volume

Part of: black and white, written communication, written language

Encyclopedia: Folio