4to

Multiple Entries:
  4to    quarto  

Concise Oxford English Dictionary © 2008 Oxford University Press:
4to
abbreviation quarto.

Concise Oxford English Dictionary © 2008 Oxford University Press:
quarto /ˈkwɔːtəʊ/ (abbrev.: 4to)
noun (pl. quartos) a page or paper size resulting from folding a sheet into four leaves, typically 10 inches × 8 inches (254 × 203 mm).

■ a book of this size.

– origin C16: from L. (in) quarto ‘(in) the fourth (of a sheet)’, ablative of quartus ‘fourth’.
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