An assertion of untruth. / (logic) The negation in logic. / A refusal or failure to provide or grant something that is requested or desired. / Refusal to believe that a problem exists.

(paper) Abbreviation of duodecimo, a page size (5-5.5 x 7.125-7.5) / (printing) A book size using duodecimo-sized pages.

In a nonphysical manner.

The state or condition of being peerless, of having no equal.