Definition of duodecimo in English:

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Pronunciation: /ˌd(y)o͞oəˈdesəmō/
Pronunciation: /ˌd(y)o͞oōˈdesəmō/
(abbreviation 12mo)

noun (plural duodecimos)

1A size of book page that results from the folding of each printed sheet into 12 leaves (24 pages). Also called twelvemo.
Example sentences
  • Smaller formats could make printing less expensive, and text from a quarto edition could be squeezed into a duodecimo with considerable savings in paper - still a precious commodity in the age before wood pulp.
  • His estimation of the capacities of youth was generous in comparison; this more aggressive abridger turned the nineteen volumes of the three novels into a 232-page duodecimo.
  • It is a bunched, busy duodecimo, and in it, the reader can find stock poetic eloquence, like his, tailored to suit his circumstances.
1.1A duodecimo book.
Example sentences
  • Such was this shameful war of Bibles - folios, quartos, and duodecimos, even in the days of Charles the First.
  • Beware, too, of the vulgar error of fancying that little duodecimos with the mark of the fox and the bee's nest, and the motto ‘Quaerendo,’ come from the press of the Elzevirs.
  • The Elzevirian duodecimos achieved great contemporary popularity, and many authors thought it an honor to have their writings included in the series.


Mid 17th century: from Latin (in) duodecimo 'in a twelfth', from duodecimus 'twelfth'.

Words that rhyme with duodecimo

octodecimo, sextodecimo

For editors and proofreaders

Syllabification: du·o·dec·i·mo

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