1. 
   Diplexer
   A circuit or system that allows the ability to transmit and receive two distinct signals simultaneously.
   Found op http://www.diracdelta.co.uk/science/source/d/i/diplexer/source.html
   
   
2. 
   Diplexer
   A diplexer is a passive device that implements frequency domain multiplexing. Two ports (e.g., L and H) are multiplexed onto a third port (e.g., S). The signals on ports L and H occupy disjoint frequency bands. Consequently, the signals on L and H can coexist on port S without interfering with each...
   Found op http://en.wikipedia.org/wiki/Diplexer
   
   
3. 
   diplexer
   a multiplexer for either two transmitters or groups of transmitters, or two receivers or groups of receivers
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=712-06-13
   
   

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