- a page size (about 5 by 7 in), of a printer's sheet
- a book with pages of this size
Origin of duodecimoshort for Classical Latin in duodecimo, in twelve: see duodecimal
with pages of this size
- The size (5 by 7 3/4 inches) of book pages formed by folding single sheets from a printing press into 12 leaves each.
- A book composed of pages of this size. In both senses also called twelvemo.
Origin of duodecimoLatin (in) duodecim&omacron;, (in) a twelfth, ablative of duodecimus, twelfth; see duodecimal.
Latin ablative of duodecimus (“twelfth”) (from duodecim 'twelve', from duo 'two' + decem 'ten')