Definition of quarto noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈkwɔːtəʊ//
    ; NAmE NAmE//ˈkwɔːrtoʊ//
    (pl. quartos) (specialist)
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  1. 1[uncountable] a size of page made by folding a standard sheet of paper twice to make eight pages
  2. 2[countable] a book with pages in quarto size an early quarto edition of Shakespeare’s plays
  3. Word Originlate 16th cent.: from Latin (in) quarto ‘(in) the fourth (of a sheet)’, ablative of quartus ‘fourth’.
See the Oxford Advanced American Dictionary entry: quarto