Wiktionary

duplex

See also: Duplex and dúplex

English

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Etymology

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PIE word
*dwóh₁

Borrowed from Latin duplex (“double, two-fold”), from duo (“two”) + plico (“fold together”); compare the roots of διπλόος (diplóos, “double”); compare also πλέκω (plékō, “twist, braid”). By surface analysis, duo- +‎ -plex.

Pronunciation

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Adjective

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duplex (not comparable)

  1. Double; made up of two parts.
    1. (architecture) Having two floors.
    2. (architecture) Having two units, divisions, suites, or apartments.
    3. (metallurgy) Of stainless steel: having a structure containing austenite and ferrite in roughly equal proportions.
      • 2010, Harold M. Cobb, The History of Stainless Steel, Materials Park, O.H.: ASM International, →ISBN, page 189:
        Duplex stainless steels have been classified according to the first period (1930–1960) and second period (1960–1990). The designations for these duplex alloys in the United States have been primarily according to Unified Numbering System (UNS) numbers in the S3xxx.x series.
  2. (telecommunications) Bidirectional (in two directions).
    Antonyms: simplex, unidirectional
    duplex telegraphy
  3. (soil science) Having horizons with contrasting textures.
    • 1977, Australian Journal of Botany, volume 25, page 462:
      Soils are duplex, sandy and solodic. The dominant trees are the stringybark eucalypts […]

Hyponyms

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(bidirectional):

Derived terms

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Translations

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A duplex (sense 1) in Bowling Green, Ohio, USA

Noun

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duplex (plural duplexes or duplices)

  1. (US, Canada, Australia) A house made up of two dwelling units.
    • 2020, Akwaeke Emezi, The Death of Vivek Oji, Faber & Faber Ltd, page 53:
      The house had been renovated into a duplex and he’d put in a phone line.
  2. (US) A dwelling unit with two floors.
  3. (philately) A cancellation combining a numerical cancellation with a second mark showing time, date, and place of posting.
  4. (juggling) A throwing motion where two balls are thrown with one hand at the same time.
  5. (biochemistry) A double-stranded polynucleotide.
  6. (geology) A system of multiple thrust faults bounded above and below by a roof thrust and floor thrust.
    • 1993, David J. Lidke, Jack Burton Epstein, Chester A. Wallace, U.S. Geological Survey Bulletin, page 16:
      In contrast, the folds in the overlying lithotectonic unit 4 are larger and are cut by a series of faults in a duplex.
    • 1995, Robert D. Hatcher, Structural Geology: Principles, Concepts, and Problems, page 211:
      It has been noted, using a combination of surface geologic and seismic reflection data, that a duplex, although formed in response to movement of a thrust sheet, frequently arches the thrust sheet as the duplex is built by duplication of rocks beneath it […]
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Translations

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See also

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Verb

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duplex (third-person singular simple present duplexes, present participle duplexing, simple past and past participle duplexed)

  1. To make duplex.
  2. To make into a duplex.
  3. (juggling) To make a series of duplex throws.
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Further reading

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French

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Etymology

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Borrowed from Latin duplex, see above.

Pronunciation

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Noun

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duplex m (plural duplex)

  1. a link between two points, such as a cable or a wire
  2. duplex, maisonette (dwelling)

Derived terms

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Further reading

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Italian

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Etymology

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Unadapted borrowing from Latin duplex.

Noun

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duplex m (invariable)

  1. (telecommunications) duplex (communications link allowing simultaneous sending and receiving)
  2. (telephony) party line
  3. (telephony) telephone or telephone user on a party line
  4. (metallurgy) duplex process (for refining steel)
  5. (architecture) two-story residence with separated living and sleeping areas
  6. (typography) duplex matrix (matrix bearing two signs next to each other)

Latin

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Latin numbers (edit)
 ←  1 II
2 		3  → 
    Cardinal: duo
    Ordinal: secundus, alter
    Adverbial: bis
    Proportional: duplus
    Multiplier: duplex, alterplex, biplex
    Distributive: bīnus
    Collective: bīniō
    Fractional: dīmidius, sēmis

Etymology

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Equivalent to duo (“two”) +‎ -plex (“-fold”). Possibly inherited from Proto-Italic *dupleks, if Umbrian 𐌕𐌖𐌐𐌋𐌀𐌊 (tuplak) is cognate (however, its meaning is uncertain and its form poses some difficulty).[1] The Italic form may be an analogical alteration (with the du- of duo replacing *dwi-) of an original Proto-Indo-European *dwi-pleḱ-s; compare Ancient Greek δίπλαξ (díplax).

Pronunciation

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Adjective

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duplex (genitive duplicis, adverb dupliciter); third-declension one-termination adjective

  1. twofold, two, double
    • 44 BCE, Cicero, De Officiis 1.104:
      Duplex omnīnō est iocandī genus, ūnum illīberāle, petulāns, flāgitiōsum, obscēnum, alterum ēlegāns, urbānum, ingeniōsum, facētum.
      In all, there are two kinds of joking: one ignoble, irreverent, shameful, obscene; the other elegant, refined, ingenious, witty.
      (literally, “In all, the kind of joking is twofold: …”)
    • 29 BCE – 19 BCE, Virgil, Aeneid 4.469–470:
      [...] Eumenidum velutī dēmēns videt agmina Penthēus,
      et sōlem geminum et duplicīs sē ostendere Thēbās [...].
      Just as the deranged Pentheus sees the ranks of Eumenides, and a twin sun, and Thebes to show herself twofold.
      (Variant accusative plural: duplicīs. For context, see: The Bacchae.)
  2. bipartite, cloven
  3. ambiguous

Declension

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Third-declension one-termination adjective.

singular plural
masc./fem. neuter masc./fem. neuter
nominative duplex duplicēs duplicia
genitive duplicis duplicium
dative duplicī duplicibus
accusative duplicem duplex duplicēs
duplicīs 		duplicia
ablative duplicī duplicibus
vocative duplex duplicēs duplicia
  • Sg.Abl. sometimes duplice.

Derived terms

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Descendants

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  • >? Galician: dobre (possibly)
  • >? Spanish: doble (possibly)
  • → English: duplex
  • → French: duplex
  • → Italian: duplice, duplex
  • → Spanish: dúplex

References

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  1. ^ De Vaan, Michiel (2008) “-plex”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 473

Further reading

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  • “duplex”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • “duplex”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • "duplex", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • duplex in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  • Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎[1], London: Macmillan and Co.
    • a twofold tradition prevails on this subject: duplex est memoria de aliqua re
    • in two, three columns: agmine duplici, triplici

Romanian

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Etymology

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Borrowed from French duplex.

Noun

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duplex n (plural duplexuri)

  1. duplex

Declension

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Declension of duplex
singular plural
indefinite definite indefinite definite
nominative-accusative duplex duplexul duplexuri duplexurile
genitive-dative duplex duplexului duplexuri duplexurilor
vocative duplexule duplexurilor
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