2 definitions found From The Collaborative International Dictionary of English v.0.44 [gcide]: Duodecimo \Du'o*dec"i*mo\, adjective [L. in duodecimo in twelfth, fr. duodecimus twelfth, fr. duodecim twelve. See {Dozen}.] Having twelve leaves to a sheet; as, a duodecimo from, book, leaf, size, etc. From The Collaborative International Dictionary of English v.0.44 [gcide]: Duodecimo \Du*o*dec"i*mo\, noun; pl. {Duodecimos}. A book consisting of sheets each of which is folded into twelve leaves; hence, indicating, more or less definitely, a size of a book; -- usually written 12mo or 12[deg].

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