from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective telecommunications Providing
communicationin both directions, but only one direction at a time, not simultaneously.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Since the thirteenth century there are three kinds of feasts: festum simplex, semiduplex, and duplex, all three regulated by the recitation of the Divine Office or Breviary.
The Roman classification of feasts is much simpler than that of other usages; feasts are called duplex, (double, the highest grade), semiduplex (semidouble) or simplex (simple), a system which refers to the doubling or non-doubling of the antiphons.