- (n.) A sheet of paper once folded.
- (n.) A leaf of a book or manuscript.
- (n.) 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.
- (n.) The page number. The even folios are on the left-hand pages and the odd folios on the right-hand.
- (n.) A page of a book; (Bookkeeping) a page in an account book; sometimes, two opposite pages bearing the same serial number.
- (n.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). folio. Retrieved September 20, 2026, from http://smartdefine.org/folio/definitions/2009128 |
| Chicago | Webster's. 2011. "folio" http://smartdefine.org/folio/definitions/2009128 (accessed September 20, 2026). |
| Harvard | Webster's 2011, folio, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/folio/definitions/2009128>. |
| MLA | Webster's. "folio" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/folio/definitions/2009128> |