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Meaning of quadruplex

quad•ru•plex

Pronunciation: (kwod'roo-pleks", kwo-dr'pleks), [key]
— adj.
  1. fourfold; quadruple.
  2. noting or pertaining to a system of telegraphy by which four messages may be transmitted simultaneously over one wire or communications channel.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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