<p><strong>noun</strong></p><ul><li>plural folios.</li><li>a sheet of paper folded once to make two leaves, or four pages, of a book or manuscript.</li><li>a volume having pages of the largest size, formerly made from such a sheet.</li><li>a leaf of a manuscript or book numbered only on the front side.</li><li>a case that, when closed, covers and protects both the screen and the back panel of a mobile device, as a tablet or smartphone.</li><li>Printing. (in a book) the number of each page.</li><li>(in a newspaper) the number of each page together with the date and the name of the newspaper.</li><li>Bookkeeping. a page of an account book or a left-hand page and a right-hand page facing each other and having the same serial number.</li><li>Law. a certain number of words, in the U.S. generally 100, taken as a unit for computing the length of a document.</li></ul><p><strong>adjective</strong></p><ul><li>pertaining to or having the format of a folio: a folio volume.</li></ul><p><strong>verb</strong></p><ul><li>(used with object), foliated, folioing.</li><li>to number each leaf or page of.</li><li>Law. to mark each folio in (a pleading or the like) with the proper number.</li></ul><p><strong>End of Response</strong></p>