"Folio" is a word in LAW AND LEGAL, HILIGAYNON, ENGLISH

1. A leaf. In the ancient law-books lt was the custom to number the leaves, instead of the pages; hence a folio would in-dude both sides of the leaf, or two pages. The references to these books are made by the number of the folio, the letters “a” and “b” being added to show which of the two pages ls intended; thus “Bracton, fol. 100a.”

A leaf of a book or manuscript.

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

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.

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.

A page of a book; (Bookkeeping) a page in an account book;
sometimes, two opposite pages bearing the same serial number.

Formed of sheets each folded once, making two leaves, or
four pages; as, a folio volume. See Folio, n., 3.

fólio - (Sp.) Folio, leaf of a book, size of a
book-leaf. (cf. pánid).

A sheet of paper once folded.

To put a serial number on each folio or page of (a
book); to page.