duplex /ˈdu.plɛks/noun 6adjective 6verb 3forms 4 noun6 •(US, Australia) A house made up of two dwelling units.The house had been renovated into a duplex and he’d put in a phone line. — 2020 •(US) A dwelling unit with two floors. •A double-stranded polynucleotide. •A system of multiple thrust faults bounded above and below by a roof thrust and floor thrust.In contrast, the folds in the overlying lithotectonic unit 4 are larger and are cut by a series of faults in a duplex. — 1993 •A cancellation combining a numerical cancellation with a second mark showing time, date, and place of posting. •A throwing motion where two balls are thrown with one hand at the same time. adjective6 •Double; made up of two parts. •Having two floors. •Having two units, divisions, suites, or apartments. •Of stainless steel: having a structure containing austenite and ferrite in roughly equal proportions. •Having horizons with contrasting textures.Soils are duplex, sandy and solodic. The dominant trees are the stringybark eucalypts […] — 1977 •Bidirectional (in two directions). verb3 •To make duplex. •To make into a duplex. •To make a series of duplex throws. formsduplexed · duplexing · duplexes · duplices