- a book size of about 9½ × 12 inches (24 × 30 centimeters), determined by folding printed sheets twice to form four leaves or eight pages. Symbols: 4to, 4°
- a book of this size.
- bound in quarto.
- a book size resulting from folding a sheet of paper, usually crown or demy, into four leaves or eight pages, each one quarter the size of the sheet
- (formerly) a size of cut paper 10 in. by 8 in. (25.4 cm by 20.3 cm)
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