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Definition of: quadruplex
(kwod′r
·pleks, kwod·r′-) adjective
1. Fourfold.
2. Pertaining to or designating a telegraph system such that four messages, two in each direction, may be sent simultaneously over one wire.
—noun A sending instrument used in quadruplex telegraphy. [<L <quattuor four + stem of plicare fold]
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