Quadruplex definitions

kwädrəpleks, kwädrupleks
Fourfold.
adjective
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Designating or of a former system of telegraphy in which four messages could be sent simultaneously over one wire, two in either direction.
adjective
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The child's toy was quadruplex and had four moving parts.

adjective
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Of or relating to a system in telegraphy by which four messages (two in each direction) can be sent on one wire simultaneously.
adjective
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A quadruplex system.
noun
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Origin of quadruplex

From Latin quadruplex (“fourfold, quadruple"), from quattuor (“four") + plico (“fold")