A folio is an old fashioned kind of book, typically made of large folded sheets of paper. In the 1600s, many of Shakespeare's plays were printed in the form of a folio.

The word folio means "leaf or sheet of paper" in Latin. A folio is made by folding one piece of paper in half — counting each side, this gives you four pages. A larger folio is simply a collection of many folded sheets bound together. In the early days of printing, the fanciest books were folios. Another method was the quarto, with two folds in each sheet and pages that had to be cut open after they were bound.

Definitions of folio
  1. noun
    a book (or manuscript) consisting of large sheets of paper folded in the middle to make two leaves or four pages
    “the first folio of Shakespeare's plays”
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    type of:
    book, volume
    physical objects consisting of a number of pages bound together
  2. noun
    a sheet of any written or printed material (especially in a manuscript or book)
    synonyms: leaf
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    a blank leaf in the front or back of a book
    a blank leaf inserted between the leaves of a book
    one side of one leaf (of a book or magazine or newspaper or letter etc.) or the written or pictorial matter it contains
    full page
    something that covers an entire page
    half page
    something that covers (the top or bottom) half of a page
    right-hand page
    left-hand page
    title page
    a page of a book displaying the title and author and publisher
    bastard title, half title
    a first page of some books displaying only the title of the book
    sports page
    any page in the sports section of a newspaper
    facing pages, spread, spread head, spreadhead
    two facing pages of a book or other publication
    foldout, gatefold
    an oversize page that is folded in to a book or magazine
    type of:
    piece of paper, sheet, sheet of paper
    paper used for writing or printing
  3. noun
    the system of numbering pages
    synonyms: page number, pagination, paging
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    type of:
    a concept of quantity involving zero and units
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