fol.

/F OW1 L/
noun
  1. 1

    A leaf of a book or manuscript

  2. 2

    A page of a book, that is, one side of a leaf of a book.

  3. 3

    A page number. The even folios are on the left-hand pages and the odd folios on the right-hand pages.

  4. 4

    A sheet of paper folded in half.

  5. 5

    (books) A book made of sheets of paper each folded in half (two leaves or four pages to the sheet); hence, a book of the largest kind, exceeding 30 cm in height.

    โ€œA rare copy of Shakespeareโ€™s First Folio.โ€

  6. 6

    A page in an account book; sometimes, two opposite pages bearing the same serial number.

  7. 7

    (19th to 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.

  8. 8

    A wrapper for loose papers.

Synonyms

Source: https://en.wiktionary.org/wiki/fol., https://en.wiktionary.org/wiki/folio