folio UK /ˈfəʊlɪəʊ/US /ˈfoʊliˌoʊ/noun 9verb 1forms 3 noun9 •A leaf of a book or manuscript. •A book made of sheets of paper each folded in half (two leaves or four pages to the sheet); hence, a book of the largest kind, exceeding 30 centimetres in height.A rare copy of Shakespeare’s First Folio. •A wrapper for loose papers. •A protective case with a flap that folds to cover the screen of a mobile device. •A page number. The even folios are on the left-hand pages and the odd folios on the right-hand pages.verso left-hand page of a book usually identified with even folio numbers. […] recto right-hand page of a book usually identified with odd folio numbers. — 2006 •A page of a book, that is, one side of a leaf of a book. •A page in an account book; sometimes, two opposite pages bearing the same serial number. •A sheet of paper folded in half. •(old-fashioned) A leaf containing a certain number of words; hence, a certain number of words in a piece of writing, as in England, in law proceedings 72, and in chancery, 90; in New York, 100 words. verb1 •To put a serial number on (a folio or page, or on all the folios or pages of a book); to foliate, to page.Folioing is necessary as an indication how far in his work the poster has proceeded, and must be done in both books immediately after each entry. — 1907 formsfolioed · folioing · folios
