folio

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A large sheet of paper folded once in the middle, making two leaves or four pages of a book or manuscript.
2. n. A book or manuscript of the largest common size, usually about 38 centimeters (15 inches) in height, consisting of such folded sheets.
3. n. A leaf of a book numbered only on the front side.
4. n. A number on such a leaf.
5. n. A page number.
6. n. Accounting A page in a ledger or two facing pages that are assigned a single number.
7. n. Law A specific number of words used as a unit for measuring the length of the text of a document.
8. v. To number consecutively the pages or leaves of (a book, for example).

Century Dictionary and Cyclopedia

1. n. A sheet of paper folded once, usually through the shorter diameter, so as to consist of two equal leaves.
2. n. A book or other publication, or a blank book, etc., consisting of sheets or of a single sheet folded once.
3. n. The size of such a book, etc.: as, an edition of a work in folio. Abbreviated fol.: as, 3 vols.
4. n. One of several sizes of paper adapted for folding once into well-proportioned leaves, whether intended for such use or not, distinguished by specific names. The untrimmed leaf of a pot folio is about 7½ × 12½ inches; foolscap folio, about 8 × 12½; flat-cap folio, 8½ × 14; crown folio or port folio, 9½ × 15; demy folio, 10½ × 16; medium folio, 12 × 19; royal folio, 12½ × 20; superroyal folio, 14 × 22; imperial folio, 16 × 22; elephant folio,14 × 23; atlas folio, 16½ × 26; columbier folio, 17¼ × 24; double-elephant folio, 20 × 27; antiquarian folio, 26½ × 31.
5. n. In bookkeeping, a page of an account-book, or both the right- and left-hand pages numbered with the same figure.
6. n. In printing, the number of a page, inserted at top or bottom.
7. n. In law, a certain number of words taken as a basis for computing the length of a document. In the United States, generally, a folio is one hundred words, each figure being counted as a word; in England, in conveyancing, etc., seventy-two words, or in parliamentary and probate proceedings ninety.
8. n. A wrapper or case for loose papers, sheet music, engravings, etc.: as, a music-folio.
9. n. In abundance; in great style (Nares); but, perhaps, in separate leaves; in flakes or fragments.
10. Pertaining to or having the form of folio; folded or adapted for folding once; consisting of leaves formed by one folding: as, a sheet or book of folio size; a folio sheet, page, newspaper, or book.
11. In printing, to number the pages of, as a book or periodical; page; paginate.
12. In law-copying, to mark with its proper figure the end of every folio in; in law-printing, to mark with its proper figure the space that should be occupied by a folio in. See folio, n., 7.

Wiktionary

1. n. A leaf of a book or manuscript.
2. n. paper A sheet of paper once folded.
3. n. books A book made of sheets of paper each folded once (two leaves or four pages to the sheet); hence, a book of the largest kind, exceeding 30 cm in height.
4. n. printing The page number. The even folios are on the left-hand pages and the odd folios on the right-hand.
5. n. A page of a book.
6. n. accounting a page in an account book; sometimes, two opposite pages bearing the same serial number.
7. n. law, dated, 19th century, early, 20th century 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.

GNU Webster's 1913

1. n. A leaf of a book or manuscript.
2. n. A sheet of paper once folded.
3. 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.
4. n. (Print.) The page number. The even folios are on the left-hand pages and the odd folios on the right-hand.
5. n. A page of a book; (Bookkeeping) a page in an account book; sometimes, two opposite pages bearing the same serial number.
6. n. (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.
7. v. To put a serial number on each folio or page of (a book); to page.
8. adj. Formed of sheets each folded once, making two leaves, or four pages. See folio, n., 3.

WordNet 3.0

1. n. a sheet of any written or printed material (especially in a manuscript or book)
2. n. a book (or manuscript) consisting of large sheets of paper folded in the middle to make two leaves or four pages
3. n. the system of numbering pages