FOLIO

folio. Folio, n. a book of two leaves to a sheet, a mark

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Fol″io (?), n.; pl. Folios (#). [[Ablative of L. folium leaf. See 4th Foil.]] 1. 1. A leaf of a book or manuscript.
2. 2. A sheet of paper once folded.
3. 3. 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.
4. 4. (Print.) The page number. The even folios are on the left-hand pages and the odd folios on the right-hand.
5. 5. A page of a book; (Bookkeeping) a page in an account book; sometimes, two opposite pages bearing the same serial number.
6. 6. (Law) 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.
Folio post, a flat writing paper, usually 17 by 24 inches.