Etymology
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duplex (adj.)

1817, "composed of two parts, double, twofold," from Latin duplex "twofold," from duo "two" (from PIE root *dwo- "two") + -plex, from PIE root *plek- "to plait." The noun in the sense of "house or other building so divided that it forms two dwelling places" (also sometimes "two-story apartment") is American English, by 1922.

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Definitions of duplex
1
duplex (n.)
a house with two units sharing a common wall;
Synonyms: duplex house / semidetached house
duplex (n.)
an apartment having rooms on two floors that are connected by a staircase;
Synonyms: duplex apartment
2
duplex (adj.)
(used technically of a device or process) having two parts;
a duplex transaction
duplex (adj.)
allowing communication in opposite directions simultaneously;
duplex system
duplex telephony
3
duplex (v.)
change into a duplex;
From wordnet.princeton.edu