1. folio - Noun
2. folio - Verb
A leaf of a book or manuscript.
A sheet of paper once folded.
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.
The page number. The even folios are on the left-hand pages and the odd folios on the right-hand.
A page of a book; (Bookkeeping) a page in an account book; sometimes, two opposite pages bearing the same serial number.
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.
Source: Webster's dictionarythe first folio of Shakespeare's plays Source: Internet
Bell, Folio ed., p. 16 As cases in St. Giles began to rise, an attempt was made to quarantine the area and constables were instructed to inspect everyone wishing to travel and contain inside vagrants or suspect persons. Source: Internet
Bell, Folio ed., p.12 As plague spread, a system of quarantine was introduced, whereby any house where someone had died from plague would be locked up and no one allowed to enter or leave for 40 days. Source: Internet
Bell Folio ed., p. 10–11 Searchers would typically learn about a death either from the local sexton who had been asked to dig a grave, or from the tolling of a church bell. Source: Internet
Álvares' writings In 1540, Luís Rodrigues published a version of Álvares account in a one volume folio, entitled Verdadeira Informação das Terras do Preste João das Indias ("A True Relation of the Lands of Prester John of the Indies"). Source: Internet
Ben Jonson mentions him in the same breath as Christopher Marlowe (with whom, in London, Kyd at one time shared a room) and John Lyly in the Shakespeare First Folio. Source: Internet