Definition of duplex:
- double (part of speech: adjective)
- duplication (part of speech: noun)
- "The Online World", Odd de Presno.
- "Modern Machine-Shop Practice, Volumes I and II", Joshua Rose.
So still was the atmosphere, so unruffled the water, that the island and the piratical- looking schooner seemed to float in the centre of a duplex world, where every cloudlet in the blue above had its exact counterpart in the blue below.- "The Madman and the Pirate", R.M. Ballantyne.