Definitions from Wiktionary ( )

▸ noun:  A leaf of a book or manuscript.
▸ noun:  A page of a book, that is, one side of a leaf of a book.
▸ noun:  (by extension, printing)
▸ noun:  A page number. The even folios are on the left-hand pages and the odd folios on the right-hand pages.
▸ noun:  A sheet of paper folded in half.
▸ noun:  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.
▸ noun:  A wrapper for loose papers.
▸ noun:  (accounting) A page in an account book; sometimes, two opposite pages bearing the same serial number.
▸ noun:  (computing) A protective case with a flap that folds to cover the screen of a mobile device.
▸ noun:  (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.
▸ verb:  (transitive) To put a serial number on (a folio or page, or on all the folios or pages of a book); to foliate, to page.

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