• a leaf of a book or manuscript
  • A page of a book, that is, one side of a leaf of a book.
  • A page number. The even folios are on the left-hand pages and the odd folios on the right-hand pages.
  • A sheet of paper folded in half.
  • A book made of sheets of paper each folded in half (two leaves or four pages to the sheet); hence, a book of the largest kind, exceeding 30 cm in height.
  • A page in an account book; sometimes, two opposite pages bearing the same serial number.
  • 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.
  • A wrapper for loose papers.


  • to put a serial number on each folio or page of (a book); to page


Similar words

Narrower meaning words

  • atlas folio
  • bifolio
  • double elephant folio
  • elephant folio


  • Borrowed from Latin foliō, the ablative singular form of folium. foil, and folium.

Modern English dictionary

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