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

In Medieval Latin, folio (ablative of folium) was used to refer to a leaf of paper. —Erik Kain, Forbes.com, 21 May 2025

The magic keyboard folio turns your iPad into a fully functioning laptop and detaches and attaches with a simple click. —Christopher Murray May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 20 May 2025

Unlike most folio cases, the cover flap doesn't fold at the back. —Julian Chokkattu, WIRED, 28 Feb. 2025

Onyx includes a stylus and a folio cover case with the package. —Ben Sin, Forbes, 28 Nov. 2024

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

1858, 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.