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Entry 8 senses · 3 variants Webster, 1913

Folio

/fōl'-ēˌ-ō/ · Fol·io · IPA /ˈfoʊliˌoʊ/
01 n. A leaf of a book or manuscript.
pl. Folios ((#))
  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. See: Paper
  4. 4.
    The page number. The even folios are on the left-hand pages and the odd folios on the right-hand.(Print.)
  5. 5.
    A page of a book; (Bookkeeping) a page in an account book; sometimes, two opposite pages bearing the same serial number.(Bookkeeping)
  6. 6.
    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.(Law)
Phrases & compounds
Folio post — a flat writing paper, usually 17 by 24 inches.
02 v. t. To put a serial number on each folio or page of (a book); to page.
  1. 1.
    To put a serial number on each folio or page of (a book); to page.
03 a. Formed of sheets each folded once, making two leaves, or four pages; as, a folio volume. See Folio, n., 3.
  1. 1.
    Formed of sheets each folded once, making two leaves, or four pages; as, a folio volume. See Folio, n., 3. See: Folio