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 seconds, the AI agent can check upcoming reservations to ensure the room is open, run the request against the housekeeping schedule, confirm the new checkout with the guest and update the folio in real time. — Amanda McGuckin Hager, Forbes.com, 13 Oct. 2026

Lenovo also throws in a Tab Pen and folio case, which is a nice bonus if taking notes or schoolwork is part of the plan. — Juhi Wadia, PC Magazine, 6 Oct. 2026

The manuscripts were separated shortly afterwards by Leoni, who, after acquiring the archives from da Vinci’s final student, elected to divide the folios into two sections, cutting out and removing portions of pages to do so. — News Desk, Artforum, 8 June 2026

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

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.