| 1. | duplex apartment. |
| 2. | duplex house. |
| 3. | paper or cardboard having different colors, finishes, or stocks on opposite sides. |
| 4. | Printing.
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| 5. | Genetics. a double-stranded region of DNA. |
| 6. | having two parts; double; twofold. |
| 7. | (of a machine) having two identical working units, operating together or independently, in a single framework or assembly. |
| 8. | pertaining to or noting a telecommunications system, as most telephone systems, permitting the simultaneous transmission of two messages in opposite directions over one channel. |
| 9. | to make duplex; make or change into a duplex: Many owners are duplexing their old houses for extra income. |