Also found in: Acronyms.
Related to sixmo: DIRL
n, pl -mos
1. (Printing, Lithography & Bookbinding) Also called: sexto a book size resulting from folding a sheet of paper into six leaves or twelve pages, each one sixth the size of the sheet. Often written: 6mo or 6°
2. (Printing, Lithography & Bookbinding) a book of this size
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014