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An individual leaf of paper or parchment, either loose as one of a series or forming part of a bound volume, which is numbered on the recto or front side only.

Recorded from late Middle English, the word comes from Latin, ablative of folium ‘leaf’, in medieval Latin used in references to mean ‘on leaf so-and-so’. The original sense of in folio (from Italian in foglio) was ‘in the form of a full-sized sheet or leaf folded once (designating the largest size of book)’.

Subjects: Medieval and Renaissance History (500 to 1500).

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