n., pl. -os.

1. 1. A large sheet of paper folded once in the middle, making two leaves or four pages of a book or manuscript.
   2. A book or manuscript of the largest common size, usually about 38 centimeters (15 inches) in height, consisting of such folded sheets.
2. 1. A leaf of a book numbered only on the front side.
   2. A number on such a leaf.
   3. A page number.
3. Accounting. A page in a ledger or two facing pages that are assigned a single number.
4. Law. A specific number of words used as a unit for measuring the length of the text of a document.

tr.v., -oed, -o·ing, -os.

To number consecutively the pages or leaves of (a book, for example).

[Middle English, from Late Latin foliō, ablative of folium, leaf of paper, from Latin, leaf.]

(1) Text management software for the professional reference publishing market from Fast Search & Transfer, Oslo, Norway and Boston, MA www.fastsearch.com). Known as FAST Folio since its acquisition in 2004 from NextPage, Inc., it provides storage, retrieval and hypertext capability for text databases and can import text from over 40 file formats. Folio search capabilities are geared to the kind of extensive reference material found in government regulations, case and tax law documents, insurance policies and accounting guidelines.

Folio was developed by Utah-based Folio Corporation, acquired by Open Market in 1997 and NextPage, Inc. in 1999. Fast Search purchased the publishing applications business unit of NextPage in 2004, which included the Folio, LivePublish, NXT and GetSmart software products.

(2) (folio) In typography, a printed page number. For example, folio 3 could be the 27th physical page in a book. A "blind folio" is a page number accounted for in pagination but not printed on the page. These occur most frequently on blank left book pages or opening pages of a chapter or article.

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paper and printing A paper size, being half of a full sheet, the actual size depending on that of the full sheet.

folio, a large size of book in which the page size results from folding a standard printer's sheet of paper in half, forming two leaves (i.e. four pages). The collected editions of Shakespeare's plays published after his death, as distinct from the earlier unauthorized quarto editions, are often referred to as the Folios: the First Folio was published by his colleagues Heming and Condell in 1623, and three others followed in 1632, 1663, and 1685.

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Dansk (Danish)
n. - folio
v. tr. - nummerere

Nederlands (Dutch)
blad, bladnummer, vouwblad, map, folioformaat, boek in folioformaat, woordaantal in afdeling van manuscript, identificerende referentie in boekhouden, nummeren

Français (French)
n. - folio, in-folio
adj. - in-folio
v. tr. - paginer

Deutsch (German)
n. - Folioblatt, Foliant, Seitenzahl
adj. - Folio-
v. - durchgehend numerieren

Ελληνική (Greek)
n. - (τυπογρ.) (τετρασέλιδο) τυπογραφικό σχήμα ή φύλλο, αριθμός σελίδας
adj. - μεγάλου σχήματος
v. - (τυπογρ.) σελιδοποιώ

Italiano (Italian)
folio, in folio

Português (Portuguese)
n. - fólio (m)
adj. - in-fólio
v. - paginar

Русский (Russian)
ин-фолио, фолиант

Español (Spanish)
n. - folio, hoja, libro en folio, hoja de contabilidad, número de página
adj. - en folio
v. tr. - foliar

Svenska (Swedish)
n. - folioformat, uppslag, sidnummer i tryckt bok, standardiserad längd för dokument (jur.)
adj. - folio-
v. - numrera varje sida

中文（简体） (Chinese (Simplified))
对开的纸, 一页, 页码或张数, 编页码

中文（繁體） (Chinese (Traditional))
n. - 對開的紙, 一頁, 頁碼或張數
v. tr. - 編頁碼

한국어 (Korean)
n. - 전지의 2절, 2절 표지
v. tr. - 장수를 세다, 페이지를 매기다

日本語 (Japanese)
n. - 二つ折り紙, 二つ折り判, ノンブル
adj. - 二つ折り判の

العربيه (Arabic)
‏(الاسم) ورقه , صفحه من سجل (صفه) رقم الصفحه (فعل) يرقم صفحات الكتاب‏

עברית (Hebrew)
n. - ‮פוליו, גיליון, דף, ספר בגודל פוליו, גיליון מלבני ארוך מהקווארטו‬
v. tr. - ‮מיספר עמודים‬

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Leather Folio	pad folio
junior folio	Adobe Font Folio 9