from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Twofold; double.
  • adj. Having two apartments, divisions, or floors.
  • adj. Relating to or being a single assembly of machinery having two identical units that are capable of operating simultaneously or independently.
  • adj. Electronics Of or relating to a communications mode, as in a telephone system, that provides simultaneous transmission and reception in both directions.
  • n. A house divided into two living units or residences, usually having separate entrances.
  • n. Something, such as an apartment, that is duplex.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. double, made up of two parts
  • adj. two direction (electronical signaling)
  • n. house made up of two dwelling units
  • n. a cancellation combining a numerical cancellation with a second mark showing time, date, and place of posting.
  • n. throwing motion where two balls are thrown with one hand at the same time.
  • v. To make duplex.
  • v. To make into a duplex.
  • v. To make a series of duplex throws.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Double; twofold.
  • adj. organized so that data may be transmitted in two opposite directions over the same channel; -- of communications channels, such as data transfer lines between computers.
  • n. something which is duplex; -- used mostly in reference to a living unit, such as an apartment, in a building having two similar living units.
  • n. a double-stranded region in a nucleic acid molecule. See deoxyribonucleic acid.
  • transitive v. To arrange, as a telegraph line, so that two messages may be transmitted simultaneously; to equip with a duplex telegraphic outfit.

from The Century Dictionary and Cyclopedia

  • Double; twofold.
  • n. A doubling or duplicating.
  • In telegraphy, to arrange (a wire) so that two messages may be transmitted along it at the same time.
  • To transmit telegraphic messages by the duplex system.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a house with two units sharing a common wall
  • v. change into a duplex
  • adj. (used technically of a device or process) having two parts
  • n. an apartment having rooms on two floors that are connected by a staircase
  • adj. allowing communication in opposite directions simultaneously


from The American Heritage® Dictionary of the English Language, 4th Edition


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin duplex ("double, two-fold"), from duo ("two") + plico ("fold together"), from Ancient Greek πλέκω (pleko, "twist, braid").



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  • Heehee!

    January 30, 2009

  • Hope they are using jam-free paper.

    January 29, 2009

  • Maybe it's a duplex-capable printer cake.

    January 29, 2009

  • I was thinking about this today. We're a small mob so as it happens we don't have a printer that will do it automatically. It can be done, by Venere, but this requires printing one side of the paper first, re-inserting same in the paper cartridge and then printing the second side.

    I was about to spend some time researching the costs of a duplex-capable printer when I smelled the strong aroma of cake sidling in from the corridor. This was most unusual. Our corridor typically smells like a hospital basement, or sweaty teenagers, or both.

    January 29, 2009

  • We've finally gone over to this practice company-wide at my office. :-)

    January 29, 2009

  • "It is incredible how much energy we waste, on a total lifecycle basis. As yet another example, why doesn't every printer support automatic duplexing, by default? That feature alone would reduce paper (and associated energy to produce it) consumption by up to 50%."

    - Timothy Sipples, blog comment on, 24 Nov 2008.

    January 29, 2009