Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • suffix Used after numerals to indicate the number of leaves that results from folding a sheet of paper: twelvemo.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • suffix Used to form page and book sizes.

from the GNU version of the Collaborative International Dictionary of English

  • A suffix added to the names of certain numerals or to the numerals themselves, to indicate the number of leaves made by folding a sheet of paper. It is taken from the Latin forms similarly used; A small circle, placed after the number and near its top, is often used for -mo; as, 16┬░, 18┬░, etc.

Etymologies

From (duodeci)mo.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ending and apparent suffix of cardinal numbers. (Wiktionary)

Examples

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