What is the meaning of Folio?

A leaf of a book or manuscript.

A page of a book, that is, one side of a leaf of a book.

1. A page number. The even folios are on the left-hand pages and the odd folios on the right-hand pages.
2. A sheet of paper folded in half.
3. 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 centimetres in height.

   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 centimetres in height.

   A wrapper for loose papers.

   A page in an account book; sometimes, two opposite pages bearing the same serial number.

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

   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.

   To put a serial number on (a folio or page, or on all the folios or pages of a book); to foliate, to page.

   folio (leaf of a book or manuscript)

   folio (sheet of paper folded in half)

   folio (book made of sheets of paper each folded in half)

   leaf

   sheet

   foil (very thin sheet of metal)

   folio (book made of sheets of paper each folded in half)

   leaf

   (thin) sheet

   folio (leaf/sheet of paper)

   folio

   1. leaf of a book or manuscript
   2. page of a book, that is, one side of a leaf of a book
   3. book made of sheets of paper each folded in half (2º)
   4. a page in an account book

   leaf of a book or manuscript

   page of a book, that is, one side of a leaf of a book

   book made of sheets of paper each folded in half (2º)

   a page in an account book

   foolscap folio, a paper size

   hotel folio (a comprehensive document that itemizes all charges incurred by a guest throughout their stay)

   to make into leaf/foil

   dative/ablative singular of folium

   first-person singular present indicative of foliar

   folio

   folio

   folio (leaf/sheet of paper)

   first-person singular present indicative of foliar

   Source: wiktionary.org