Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A leaf of a book or manuscript.
  • n. A sheet of paper once folded.
  • n. A book made of sheets of paper each folded once (two leaves or four pages to the sheet); hence, a book of the largest kind, exceeding 30 cm in height.
  • n. The page number. The even folios are on the left-hand pages and the odd folios on the right-hand.
  • n. A page of a book.
  • n. a page in an account book; sometimes, two opposite pages bearing the same serial number.
  • n. A leaf containing a certain number of words, hence, a certain number of words in a writing, as in England, in law proceedings 72, and in chancery, 90; in New York, 100 words.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Formed of sheets each folded once, making two leaves, or four pages. See folio, n., 3.
  • n. A leaf of a book or manuscript.
  • n. A sheet of paper once folded.
  • n. A book made of sheets of paper each folded once (four pages to the sheet); hence, a book of the largest kind. See Note under Paper.
  • n. The page number. The even folios are on the left-hand pages and the odd folios on the right-hand.
  • n. A page of a book; (Bookkeeping) a page in an account book; sometimes, two opposite pages bearing the same serial number.
  • n. A leaf containing a certain number of words, hence, a certain number of words in a writing, as in England, in law proceedings 72, and in chancery, 90; in New York, 100 words.
  • transitive v. To put a serial number on each folio or page of (a book); to page.

from The Century Dictionary and Cyclopedia

  • n. A sheet of paper folded once, usually through the shorter diameter, so as to consist of two equal leaves.
  • n. A book or other publication, or a blank book, etc., consisting of sheets or of a single sheet folded once.
  • n. The size of such a book, etc.: as, an edition of a work in folio. Abbreviated fol.: as, 3 vols.
  • n. One of several sizes of paper adapted for folding once into well-proportioned leaves, whether intended for such use or not, distinguished by specific names.
  • n. In bookkeeping, a page of an account-book, or both the right- and left-hand pages numbered with the same figure.
  • n. In printing, the number of a page, inserted at top or bottom.
  • n. In law, a certain number of words taken as a basis for computing the length of a document.
  • n. A wrapper or case for loose papers, sheet music, engravings, etc.: as, a music-folio.
  • n. In abundance; in great style (Nares); but, perhaps, in separate leaves; in flakes or fragments.
  • Pertaining to or having the form of a folio; folded or adapted for folding once; consisting of leaves formed by one folding: as, a sheet or book of folio size; a folio sheet, page, newspaper, or book.
  • In printing, to number the pages of, as a book or periodical; page; paginate.
  • In law-copying, to mark with its proper figure the end of every folio in; in law-printing, to mark with its proper figure the space that should be occupied by a folio in. See folio, n., 7.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a sheet of any written or printed material (especially in a manuscript or book)
  • n. a book (or manuscript) consisting of large sheets of paper folded in the middle to make two leaves or four pages
  • n. the system of numbering pages

Etymologies

Middle English, from Late Latin foliō, ablative of folium, leaf of paper, from Latin, leaf; see bhel-3 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ablative singular form of folium ("leaf") (Wiktionary)

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