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Definition of: duodecimo
(d′ō·des′ə·mō, dy′-) adjective
1. Having twelve pages or leaves to one sheet of printing paper.
2. Being about 4 1/2 by 7 1/2 inches in size: said of a page or book. Written also 12 mo, 12°.
—noun plural ·mos
1. The size of a page folded twelve to a sheet; also, a page or a book of this size.
2. Music An interval of a twelfth. [<L (in) duodecimo (in) twelfth]
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