'Quadruplex system' definitions:
Definition of 'Quadruplex system'
From: GCIDE
- 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]