1. diplex - Adjective
2. diplex - Verb
diplex (not comparable)
(telegraphy) Involving the transmission of two messages in the same direction at the same time.
Diplex and contraplex are the two varieties of duplex.
(radio) Simulcast the same signal on two frequencies.
(radio) Combine two signals using two frequencies onto one cable.
Source: en.wiktionary.org