Fol"io (?), n.; pl.
Folios (#). [Ablative of L. folium leaf. See
4th Foil.] 1. A leaf of a book or
manuscript.
2. A sheet of paper once folded.
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. (Print.) The page number. The even
folios are on the left-hand pages and the odd folios on the right-
hand.
5. A page of a book; (Bookkeeping) a
page in an account book; sometimes, two opposite pages bearing the
same serial number.
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.
Fol"io, v. t. To put a serial
number on each folio or page of (a book); to page.
Fol"io, a. Formed of sheets each
folded once, making two leaves, or four pages; as, a folio
volume. See Folio, n., 3.