- duplex - (used technically of a device or process) having two parts; "a duplex transaction"
Antonym: single (indirect, via multiple)
- duplex - allowing communication in opposite directions simultaneously; "duplex system"; "duplex telephony"
Antonym: unidirectional (indirect, via bidirectional)
- duplex house, duplex, semidetached house - a house with two units sharing a common wall
--1 is a kind of house
- duplex apartment, duplex - an apartment having rooms on two floors that are connected by a staircase
--2 is a kind of apartment, flat