folio

1. (by extension, printing)Examples: "Folio.—The running number of the pages of a work. When there is no running title, the folio is placed in the centre of the head-line; when there is a running title, at the outside corner—the even folio on the left, the odd on the right. The preface, contents, index, and all introductory matter, usually have separate folios inserted in Roman lower-case numerals."; "verso left-hand page of a book usually identified with even folio numbers. […] recto right-hand page of a book usually identified with odd folio numbers."broadly

2. (by extension, printing)Examples: "This pocket copying-machine, by which letters and writings of all sizes, even folio, may be very quickly copied, consists of a press four inches long, with a small cylinder, which contains pens and ink: the whole apparatus may be conveniently carried in the pocket, and the price is very moderate."broadly

3. (by extension, printing)Examples: "A rare copy of Shakespeare’s First Folio."; "A treatiſe in Folio, intitled, The Magazen of Honour, or a Treatiſe concerninge the Nobillitie of England accordinge to the Lawes of England, with their Priviledges in Parliament, & in what caſes noe priviledge, together with the Etymologie, definition & antiquitie of 3 ſortes of Barons."; "Another, with the bump of order unnaturally developed, had his folios and quartos all reduced, in binding, to one size, so that they might look even on his bookshelves."Synonyms: F, f, fo, 2ºbroadly

4. (accounting) A page in an account book; sometimes, two opposite pages bearing the same serial number.Examples: "In the leger,^([sic]) articles of the ſame kind are collected together; and, for that purpoſe, it is divided into many accounts, under which the different branches of buſineſs are arranged. Each account is introduced by a proper title, to explain the nature of the articles it contains; and articles of oppoſite kinds, which belong to the ſame account, are placed on the oppoſite pages of the ſame folio: for inſtance, money received on the one ſide, and money paid on the other; or goods bought on the one ſide, and goods ſold on the other."

5. (computing) A protective case with a flap that folds to cover the screen of a mobile device.

6. (law, dated) A leaf containing a certain number of words; hence, a certain number of words in a piece of writing, as in England, in law proceedings 72, and in chancery, 90; in New York, 100 words.Examples: "[page 172] When actions are brought in the Courts of King's Bench or Common Pleas, founded upon original writs issuing out of the Courts of Chancery (which writs, as stated in the Report of the 9th of April 1816, it is the duty of the Cursitors to make out) it has been the practice in certain cases for the Filacers of the Courts of King's Bench and Common Pleas respectively, to receive from the Suitors the King's fines (if any) and also the fees payable to the Cursitors in respect of such original writs, and afterwards to account to the Cursitors for the fines and fees so received. […] [page 176] The Cursitors have claimed before us a right to compute the skin in all cases, at twenty folios, each folio containing seventy-two words; and to charge 1 s. 4 d. for every folio, instead of the fees now taken per folio or per skin, where the writ in charged in that manner. In support of this claim they have contended, that twenty folios of seventy-two words each, were established by the Order of 1743, as the length of a skin; […] The writ [of Transgress' super Casum], exclusive of the part containing the matter of the declaration, contains less than two folios of seventy-two words each; common counts are stated to contain usually, from two to three folios; special counts are usually longer, and sometimes of a much greater length."; "If the office copy of a Will or any part of a Will or other document is required to be made fac-simile, and such Will or part of a Will or other document is two folios of ninety words in length or under, in addition to the fee for the copy … … … … [£]0 1[s.] 0[d.] / If exceeding two folios of ninety words, for every additional folio or part of a folio … … [£]0 0[s.] 6[d.]"dated