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1North American a house divided into two apartments, with a separate entrance for each. an apartment on two floors. 2 Biochemistry a double-stranded polynucleotide molecule.
1having two parts, in particular. North American (of a house) consisting of two apartments. North American (of an apartment) on two floors. (of paper or board) having two differently colored layers or sides. (of a printer or its software) capable of printing on both sides of the paper. 2(of a communications system, computer circuit, etc.) allowing the transmission of two signals simultaneously in opposite directions. Compare with multiplex, simplex.