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.
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How to use quarto in a sentence
John Laurence Berti, a learned monk of Tuscany, died; author of about 20 quarto volumes of divinity.The Every Day Book of History and Chronology | Joel Munsell
In about a fortnight I again launch into the World in the shape of a quarto Volume.Private Letters of Edward Gibbon (1753-1794) Volume 1 (of 2) | Edward Gibbon
It was a piece of patterned stuff about the size of the quarto page, to which it was fastened by an old-fashioned pin.A Thin Ghost and Others | M. R. (Montague Rhodes) James
One of the latter contains a wood-cut of the Manchester Royal Institution, and eight quarto pages for three-pence.
The remarkable thing is, as regards Hamlet, that they almost all occur in passages not present in the First quarto.Montaigne and Shakspere | John M. Robertson
British Dictionary definitions for 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: Often written: 4to, 4°
(formerly) a size of cut paper 10 in. by 8 in. (25.4 cm by 20.3 cm)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012