n.
Pronunciation: ' f ō -l ē - ˌ ō
Function: noun
Inflected Form: plural fo · li · os
Etymology: Middle English, from Latin, ablative 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