folio

1 of 2

noun

fo·​lio ˈfō-lē-ˌō 

plural folios

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

folio

2 of 2

verb

folioed; folioing; folios

transitive verb

: to put a serial number on each leaf or page of

Examples of folio in a Sentence

Recent Examples on the Web

Noun

With rides processed through Mews Payments, charges flow automatically to the guest folio, which is the same unified bill that covers the room, the minibar, and the spa. —Catherina Gioino, Fortune, 29 May 2026

Lenovo also includes a folio case in the box, which makes the whole thing feel a little more premium right away. —Juhi Wadia, PC Magazine, 26 May 2026

The display has stylus support and there’s both a stylus and a folio case included in the box. —Ewan Spence, Forbes.com, 22 May 2026

This ambitious folio of a novel also takes the next generation seriously, from several angles. —Brittany Allen, Literary Hub, 16 Mar. 2026

Word History

Etymology

Noun

Middle English, from Latin, ablative of folium

First Known Use

Noun

15th century, in the meaning defined at sense 1a

Verb

1875, in the meaning defined above

Kids Definition

folio

noun

fo·​lio

ˈfō-lē-ˌō

plural folios

1

: a leaf of a manuscript or book

2

a

: a book made up of sheets of paper that have been folded to produce two leaves

b

: a very large book

Legal Definition

folio

noun

fo·​lio ˈfō-lē-ˌō 

: a certain number of words taken as a unit or division in a document for purposes of measurement or reference

Note: A folio by statutory provision generally consists of 100 words.