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From Latin quadruplex (fourfold, quadruple), from quattuor (four) + plico (fold).


quadruplex (not comparable)

  1. Having four components.
  2. Of or relating to a system in telegraphy by which four messages (two in each direction) can be sent on one wire simultaneously.
  3. Of or relating to an early videotape format with four magnetic record/reproduce heads mounted on a headwheel spinning transversely across the tape.



quadruplex (countable and uncountable, plural quadruplexes)

  1. (countable) A quadruplex system.
    • 1905 August 12, Electrical World and Engineer, volume XLVI, number 7, New York, N.Y., page 256, column 1:
      The Western Union office is equipped with four quadruplexes, three duplexes and eleven single loops, besides special private loops in the Japanese and Russian suites, where direct communication will be maintained with the Atlantic cables at Heart’s Content, Newfoundland via Canso, and also with the Western Union offices in New York, whence the Japanese diplomatic matter will be sent via land lines to San Francisco over a direct circuit.
  2. (uncountable) Clipping of quadruplex videotape, an early type of videotape with four magnetic record/reproduce heads mounted on a headwheel spinning transversely across the tape.

Derived terms[edit]



quadruplex (third-person singular simple present quadruplexes, present participle quadruplexing, simple past and past participle quadruplexed)

  1. (transitive) To make quadruplex.


Latin numbers (edit)
[a], [b] ←  3 IV
5  → [a], [b], [c], [d]
    Cardinal: quattuor
    Ordinal: quārtus
    Adverbial: quater
    Multiplier: quadruplex, quadruplus
    Distributive: quaternus, quadrīnus
    Collective: quaterniō
    Fractional: quadrāns, teruncius


From quattuor (four) +‎ -plex (-fold).



quadruplex (genitive quadruplicis); third-declension one-termination adjective

  1. fourfold, quadruple


Third-declension one-termination adjective.

Number Singular Plural
Case / Gender Masc./Fem. Neuter Masc./Fem. Neuter
Nominative quadruplex quadruplicēs quadruplicia
Genitive quadruplicis quadruplicium
Dative quadruplicī quadruplicibus
Accusative quadruplicem quadruplex quadruplicēs quadruplicia
Ablative quadruplicī quadruplicibus
Vocative quadruplex quadruplicēs quadruplicia


quadruplex n (genitive quadruplicis); third declension

  1. a fourfold amount


Third-declension noun (neuter, imparisyllabic non-i-stem).

Case Singular Plural
Nominative quadruplex quadruplica
Genitive quadruplicis quadruplicum
Dative quadruplicī quadruplicibus
Accusative quadruplex quadruplica
Ablative quadruplice quadruplicibus
Vocative quadruplex quadruplica

Related terms[edit]


  • English: quadruplex


  • quadruplex”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • quadruplex”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • quadruplex in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.