"duplex" in the noun sense
1. duplex house, duplex, semidetached house
a house with two units sharing a common wall
2. duplex apartment, duplex
an apartment having rooms on two floors that are connected by a staircase
"duplex" in the verb sense
change into a duplex
"duplex" in the adjective sense
used technically of a device or process) having two parts
"a duplex transaction"
allowing communication in opposite directions simultaneously
Source: WordNet® (An amazing lexical database of English)
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