Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective telecommunications Providing communication in both directions, but only one direction at a time, not simultaneously.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

semi- +‎ duplex

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Examples

  • 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 Catholic Encyclopedia, Volume 6: Fathers of the Church-Gregory XI 1840-1916 1913

  • 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.

    New Liturgical Movement 2009

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