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3 definitions found
 for quadruplex
From The Collaborative International Dictionary of English v.0.48 :

  Quadruplex \Quad"ru*plex\, a. [L., from quattuor four + plicare
     to fold.]
     Fourfold; folded or doubled twice.
     [1913 Webster]
  
     Quadruplex system (Electric Telegraph), a system by which
        four messages, two in each direction, may be sent
        simultaneously over the wire.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  quadruplex
      adj 1: having four units or components; "quadruple rhythm has
             four beats per measure"; "quadruplex wire" [syn:
             quadruple, quadruplicate, quadruplex, fourfold,
             four-fold]

From The Free On-line Dictionary of Computing (18 March 2015) :

  quadruplex
  
      A kind of telegraphy system developed by
     Thomas A. Edison in the 1870s combining diplex and duplex
     communications to support simultaneous transmission of two
     messages in each direction.
  
     (2000-04-02)
  

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