<p><strong>Noun:</strong></p><ul><li>Duplex apartment.</li><li>Duplex house.</li><li>Paper or cardboard having different colors, finishes, or stocks on opposite sides.</li><li><strong>Printing:</strong> A method of reproducing an illustration using two halftone plates, one black and the other in a color.</li><li>A printing press equipped to print both sides of a sheet in one pass.</li><li><strong>Genetics:</strong> A double-stranded region of DNA.</li></ul><p><strong>Adjective:</strong></p><ul><li>Having two parts; double; twofold.</li><li>(Of a machine) Having two identical working units, operating together or independently, in a single framework or assembly.</li><li>Pertaining to or noting a telecommunications system, as most telephone systems, permitting the simultaneous transmission of two messages in opposite directions over one channel.</li></ul><p><strong>Verb (used with object):</strong></p><ul><li>To make duplex; make or change into a duplex: Many owners are duplexing their old houses for extra income.</li></ul>