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an apartment with two floors each with its own rooms connected by an internal staircase
duplex apartment
a residential building that contains two separate living units or residences, typically stacked on top of each other or side by side
a house with two units sharing a common wall
duplex house
semidetached house
*** (of a flat) with rooms on two floors
allowing communication in opposite directions simultaneously
(of machinery) having two parts working at the same time or in the same way
*** (of a house) joined to another house by a wall on one side that is shared
change into a duplex
