duplex
adj 1: (used technically of a device or process) having two parts;
"a duplex transaction"
2: (telecommunication) allowing communication in opposite
directions simultaneously; "duplex system"; "duplex
telephony"
n 1: a house with two units sharing a common wall [syn: {duplex
house}, {semidetached house}]
2: an apartment having rooms on two floors that are connected
by a staircase [syn: {duplex apartment}]