fo·​lio | \ ˈfō-lē-ˌō How to pronounce folio (audio) \
plural folios

Definition of folio

 (Entry 1 of 2)

1a : 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
2a : a sheet of paper folded once
b : a case or folder for loose papers
3a : 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


folioed; folioing; folios

Definition of folio (Entry 2 of 2)

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 The streamlined case snaps on and features a folio cover to protect the screen, which can also be folded to use as a stand. Stephen Slaybaugh, Popular Mechanics, 20 June 2022 Matthew Jocelyn, whose libretto boldly cuts and reweaves different folio versions of Shakespeare’s text, said hearing Clayton in the workshops was useful in both practical and intuitive ways. New York Times, 24 May 2022 Bellroy Travel Folio Keep your passport, boarding documents, vaccine card and other travel essentials in one sleek spot with Bellroy’s leather folio. Danielle Directo-meston, The Hollywood Reporter, 11 Mar. 2022 The folio part is a magnetic stand for the back side, which can snap flat or be extended, Microsoft Surface-style, as a leg to support the screen. Matthew Buzzi, PCMAG, 28 Feb. 2022 The folio stand and keyboard—which are removable but do come bundled with the device—add another 0.95 pound. Matthew Buzzi, PCMAG, 28 Feb. 2022 The travel folio with RFID protection fits two passports, four to eight credit cards, cash, boarding passes and other essential documents, while the wide-opening pouch is ideal for stowing away (and easily accessing) toiletries, cables and more. Danielle Directo-meston, The Hollywood Reporter, 1 Feb. 2022 Three full-size portraits accompanied them to Washington, where they are joined by about a dozen 16th- and 17th-century folio-size paintings from the trove in the galleries’ storage. Lee Lawrence, WSJ, 29 Jan. 2022 The magnets hold the stylus firmly in place (even with the iPad in a folio case) and when not in use, the stylus is safely out of the way. Brad Moon, Forbes, 28 Dec. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'folio.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of folio


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


1858, in the meaning defined above

History and Etymology for folio


Middle English, from Latin, ablative of folium

Learn More About folio

Time Traveler for folio

Time Traveler

The first known use of folio was in the 15th century

See more words from the same century

Dictionary Entries Near folio




See More Nearby Entries 

Statistics for folio

Last Updated

27 Jun 2022

Cite this Entry

“Folio.” Dictionary, Merriam-Webster, Accessed 30 Jun. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for folio


fo·​lio | \ ˈfō-lē-ˌō How to pronounce folio (audio) \

Legal Definition of folio

: 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.

More from Merriam-Webster on folio

Thesaurus: All synonyms and antonyms for folio

Nglish: Translation of folio for Spanish Speakers


Test Your Vocabulary

Name That Food

  • a-light
  • Name these cookies!
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!