Folio

Folio:

In bookbinding, a sheet of paper, parchment, or other material folded in half to make two leaves in a codex.
A sheet of paper, parchment, or other material used as a single leaf in a codex.
A book bound from folio sheets, usually 15" tall or more; see bookbinding.
Any unusually large and noteworthy book edition, such as the First Folio of William Shakespeare.
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