Main Entry: ¹fo·lio

Pronunciation: \ˈfō-lē-ˌō\

Function: noun

Inflected Form(s): plural fo·li·os

Etymology: Middle English, from Latin, abl. of folium

Date: 15th century

1 a : a leaf especially of a manuscript or book b : a leaf number c : a page number d : an identifying reference in accounting used in posting
2 a : a sheet of paper folded once b : a case or folder for loose papers
3 a : the size of a piece of paper cut two from a sheet; also : paper or a page of this size b : a book printed on folio pages c : a book of the largest size
4 : a certain number of words taken as a unit or division in a document for purposes of measurement or reference