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Definition of duplex : 1. Double; twofold.
2. To arrange, as a telegraph line, so that two messages may be transmitted simultaneously; to equip with a duplex telegraphic outfit.

Synonyms:

multiple, bidirectional, geminate, semidetached house, biform, part, duplex apartment, duplex house, twofold

duple, two-sided, twice, dyadic, two, double-barreled, bi-form, paired, double-faced, bifurcated, second, binary, dual, bilateral, twinned, two-faced, two-fold, double, twin, duplicate, dualistic

bifurcation, duo

Usage examples:

• Full- duplex is simultaneous two- way communication. - "The Online World", Odd de Presno.
• Slide rests for self- acting or engine lathes are divided into seven kinds, termed respectively as follows: simple, or single, elevating, weighted, gibbed, compound, duplex, and duplex compound. - "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.