Definition of duplex in English:



  • 1North American A residential building divided into two apartments.

    • ‘The Thompsons lived in Langley for a short time, then bought an old house on Lonsdale Avenue and restored it into a duplex.’
    • ‘It notes that three-bed semi-detached houses are on the wane in Dublin, being replaced by smaller two-bed duplexes, townhouses and apartments.’
    • ‘My grandparents have been trying to sell their duplex for about 7 months now.’
    • ‘Four miles from the city centre, Heath Square comprises 72 apartments, duplexes and showhouses.’
    • ‘In the city centre, apartments and duplexes saw healthy investor activity due to the tax incentives in operation.’
    • ‘Council modified its original motion to allow for demolition and the construction of single unit buildings and duplexes.’
    • ‘By the end of this year, Pangnirtung will have also received 11 social housing units, both duplexes and single dwellings.’
    • ‘In most suburban communities, it's against the law to build apartment buildings, it's against the law to build duplexes, it's against the law to have small lots.’
    • ‘Typically first time buyers are purchasing two-bedroom houses or one to two-bedroom apartments and duplexes in these areas.’
    • ‘Both apartments and duplexes have a generous electrical specification.’
    • ‘Apartments and duplexes became the norm rather than the exception, much to the delight of rookie buyers and older couples trading down.’
    • ‘The Calgary Women Building a Legacy project will hold a ground blessing ceremony on May 5 at an Ogden site that will see the construction of a duplex for two working families living on incomes that fall below the poverty line.’
    • ‘Within five minutes they pulled up in front of a blue and white duplex, surrounded by several more identical duplexes.’
    • ‘According to a preliminary report, nine lots in the area range in width from 22 to 28 feet, house a single family home, could hold a secondary suite and provide density similar to duplexes.’
    • ‘On one street, I was told that every other house was a duplex that hosted students, neither registered as lodging nor paying fees.’
    • ‘We entered a search for apartments / duplexes costing up to €600,000.’
    • ‘The property has full planning permission for 30 residential units comprising six three-bedroom townhouses, 12 two-bedroom duplexes and 12 one-bedroom apartments.’
    • ‘At 15 she qualified to live by herself under state care, and it was while she was living in a Surrey duplex that she was impregnated.’
    • ‘First-time buyers are now moving to the commuter belt in bigger numbers, or else changing their lifestyles and moving into duplexes and apartments.’
    • ‘They own a duplex and live in the bottom half, and the recent tenants were also loud, but due to the rent bureau there, there is absolutely no way for them to get rid of the tenants (unless a family member wants to move in, or they sell the place).’
    1. 1.1 A flat on two floors.
      as modifier ‘a plush Mayfair duplex flat’
      • ‘The three-bed duplexes are located on the bottom two floors of the blocks with the two-bedroom apartments above.’
      • ‘The facades suggest that the apartment floor and unit arrangements may be double-height spaces, duplexes, or regular floors carefully hidden behind the cool glass facade.’
      • ‘Over the past few months he has shed more than 30 pounds and moved his family into a Park Avenue duplex, jetting back regularly to Vivendi's Paris headquarters on the company plane.’
      • ‘So we've had people here for quite a while living in huts, lean-tos, wood cabins and split-level duplexes with Italian marble counters.’
      • ‘Above the one-bed apartments are the two-bedroom duplexes, priced from £168,950 and extending to 72 square metres.’
      • ‘Also available are three-bedroom duplexes on the ground and first floors; these have 105 square metres of accommodation and are selling for €228,000.’
      • ‘Under the plans the Wheatley would be converted to provide two, two bedroom duplexes and a pair of two bedroom flats.’
      • ‘Two-bedroom townhouses and three-bedroom duplexes will be launched, with prices starting from €225,000.’
      • ‘The townhouses and three-bedroom duplexes will also include fireplaces, en suite bathrooms, downstairs guest bathrooms and tongue and groove timber flooring on the top floor.’
      • ‘The terrace wrapped around the first floor of her duplex and was accessible from most rooms.’
      • ‘This elite section is where you find the big penthouses and duplexes.’
      • ‘I understand that four and five bed duplexes are also available.’
      • ‘Other features include en suite bathrooms in the two and three-bedroom units, private gardens with ground floor units and large balconies off the two-bed duplexes.’
      • ‘A new scheme of 70 units, consisting of two- and three-bedroom apartments and duplexes, ranging in price from €245,000 to €280,000 and due to launch around January 20.’
      • ‘Duplex apartments start at €279,000 for a two-bedroom unit while a three-bed duplexes with gardens costs from €360,000.’
      • ‘Larger two-bedroom apartments and duplexes measuring 67 to 105 square metres cost between €265,000 and €429,500.’
      • ‘Three-bedroom duplexes with 1,195 sq ft of living space start at €385,000 and two-bedroom townhouses of 820 sq ft are priced from €360,000.’
      • ‘Studio flats at this converted mill have already been snapped up - guide prices started at £70,000 - but two- and three-bedroom duplexes are still available.’
      • ‘Duplex apartments start at €310,000 for a two-bedroom unit, while three-bedroom duplexes with gardens are available from €385,000.’
      • ‘Young families will be especially interested in the three-bedroom duplexes and townhouses.’
    2. 1.2Australian A semi-detached house.
      • ‘When complete, KilgobbinWood will include a number of apartment blocks as well as five-bedroom detached, semi-detached houses, townhouses and duplexes.’
      • ‘A major overseas developer has proposed an array of architecturally designed houses, duplexes and apartments up to eight storeys high on the Rifle Range block at the start of Papamoa Beach Rd.’
      • ‘A few hours later a helicopter thumps past the huskies curled up on top of their dog houses, past the newly built duplexes still wrapped in Tyvek.’
      • ‘It can be a house, duplex or apartment, but not a caravan or mobile home.’
      • ‘We have been driving on the Hill of the Roses, where he stopped in front of a huge duplex.’
      • ‘You see, tensions run even higher because we actually live in a duplex.’
      • ‘The resolution, first reported on Feb.14, would place serious restrictions on the ability of students to live in houses and duplexes.’
      • ‘The shelter uses half of a Yukon Housing duplex at Dugas Street and Front Street.’
      • ‘This category is restricted to people living in units, duplexes or Green-street style dwellings where lot sizes are 400 square metres or less.’
      • ‘A total of 13 different unit styles will be available, including duplexes, townhouses and houses.’
      • ‘More than 70 freestanding two-story houses in six configurations-from two-bedroom duplexes of 1,000 square feet to four-bedroom dwellings of 1,800 square feet-have been built so far.’
      • ‘Show apartments are open today from 2-5pm while the agents are also taking bookings for three-bed duplexes and five-bed houses elsewhere in the Addison Park scheme.’
      • ‘Cahaba residents rented from the government until 1947, when the houses and duplexes were sold to individuals at prices ranging from $4,400 to $9,000 each.’
      • ‘She asked him to stop the car in front of a graceful duplex: a low, country house with wide porches complete with wooden table and chairs.’
      • ‘In its place now sits four modern beige coloured duplexes.’
      • ‘When completed the scheme will consist of 30 two-bedroom townhouses, eight three-bedroom end houses, 17 three-bedroom duplexes and 17 two-bedroom own door apartments.’
      • ‘The name means ‘style’ in Urdu, and the restaurant occupies the same duplex that used to house Girafe.’
      • ‘The resolution also includes a clause reiterating an existing law that prevents more than four unrelated persons from living together in one house or duplex.’
      • ‘Snowdon residents have been duelling it out by petition concerning Addington House, a drug rehab centre recently transplanted from NDG to a semi-detached duplex at Earnscliffe and Dupuis.’
      • ‘The architectural setting of casual schoolboys, in their smart suburban Ballajura school, can be contrasted with urban atmosphere of the Lincoln Street duplexes.’
  • 2Biochemistry
    A double-stranded polynucleotide molecule.

    • ‘In this work, the molar concentrations of the oligonucleotide duplexes are related to the double-stranded molecules 15-bp long.’
    • ‘Closed circular DNA usually exists in a supercoiled, plectonemic configuration, in which the DNA duplex is wound around another part of the same molecule to form a higher order helix.’
    • ‘Helicases are protein motors that use the energy of NTP hydrolysis to dissociate the hydrogen bonding between the nucleic acid duplexes and also to disrupt other non-covalent interactions between complementary base pairs.’
    • ‘The drugs in the latter complexes are covalently connected by a peptide linker, whereas those associated with the oligonucleotide duplexes are chemically independent species.’
    • ‘Unlike larger polypeptides and proteins, small nucleic acid duplexes and hairpins do not have a dense core to which this effect would apply.’


  • 1North American (of a house) consisting of two flats.

    • ‘Exemptions on the thousands of apartments, single-family, and duplex homes built in that short five-year period amounted to almost a billion dollars.’
    • ‘The duplex houses are better where the bedrooms are on the first floor.’
    • ‘Three-bedroom duplex houses start at £174,950 and have around 124 square metres of accommodation.’
    • ‘The residential sector is 10,000 square feet in size and will include single family, duplex and multi-household residences constructed out of alternative building materials.’
    • ‘According to government statistics, the number of large units due for completion in 2005 will decline 60 per cent, not to mention duplex and luxury houses, supplies of which are expected to be scarce.’
    • ‘First-time buyers will be interested in the launch of phase two of Bryanstown Manor, a development of apartments and duplex houses near the train station in Drogheda, Co Louth.’
    • ‘One is for good quality standard apartments, duplex units or townhouses in central city locations or beside major employment or commercial centres.’
    • ‘The development comprises a mix of three bedroom townhouses, four bedroom semi-detached and detached houses along with two bedroom apartments and three bedroom duplex houses.’
    • ‘The first batch of 40 two-bedroom apartments and three-bedroom duplex houses were completed and sold last February.’
    • ‘There are also a few two-bedroom duplex townhouses available with prices starting at £160,000.’
    • ‘The permission provided for the construction of 20 two-bedroom townhouses, eight two-bedroom duplex houses and eight one-bedroom garden level apartments.’
    • ‘Another part of the development is 24 two bedroom duplex houses, each having its own front garden.’
    • ‘Each of the two-bedroom duplex townhouses in this phase will range in size from 82 to 98 square metres, with prices from €224,900.’
    • ‘Prices for the three bedroom duplex houses, which measure 108 square metres, start at €400,000.’
    • ‘In the three-bedroom duplex houses, the ground floor accommodation comprises a living room, separate kitchen/dining area and cloakroom.’
    • ‘Three bedroom duplex townhouses have around 120 square metres and start at £171,500.’
    1. 1.1 (of a flat) on two floors.
      • ‘Their scheme includes 12 two-bedroom duplex apartments in a two storey plus dormer block on part of the site, and the construction of a pub, lounge, community meeting room and ancillary services in a separate building on the site.’
      • ‘The spacious three-bedroom duplex apartments contain between 102 and 139 square metres of living space and are priced from €257,000.’
      • ‘Offers of around €700,000 will be considered for 5 Woodview, a duplex apartment located within a short walk of Blackrock village.’
      • ‘They will be a mixture of one bedroom, two bedroom and duplex apartments.’
      • ‘The top accommodation are duplex apartments costing 2,000 dollars a day per person.’
      • ‘There is a lot of cupboard space in both apartments and duplex apartments.’
      • ‘Blocks A, B, C and D each incorporate 3 two bed townhouses, 4 two bed ground level apartments and 4 three bed duplex apartments.’
      • ‘In addition, it is proposed to construct a duplex apartment containing a one-bedroom home on the ground floor and a two bedroom home spread over the first and second floors.’
      • ‘After a second or two, he pushes himself off the bed and heads down the hall to the stairwell of his duplex apartment.’
      • ‘There is full planning permission for a scheme of 12 two-bedroom duplex apartments and 18 car parking space.’
      • ‘A total of 42 units are now available, at prices from €243,000 for a two-bedroom duplex apartment with a private roof garden and 70 square metres of accommodation.’
      • ‘Two duplex apartments are stacked above a shop at ground level, the floors linked by a narrow communal staircase inserted into an intermediate slot between the new and old buildings.’
      • ‘The spacious four-bedroom duplex apartments are 116 square metres in size, with prices starting from €320,000.’
      • ‘It will also incorporate a high tech business and conference centre, 66 duplex apartments, a leisure centre, entertainment centre, office development and crèche.’
      • ‘The plans provide for eight dwelling-houses, six ground floor apartments, six duplex apartments, an office and all ancillary site works.’
      • ‘The company has applied to build 12 two-bedroom duplex apartments in a two-storey plus dormer block, as well as a public house in a two-storey plus dormer building with over basement car parking.’
      • ‘Well, it wasn't quite the top - there's a second floor to the duplex penthouse we couldn't make it to - but the views are magnificent, largely because the building is taller by half than most everything else in the neighborhood.’
      • ‘It will comprise a retail unit, five ground floor flats and eight duplex apartments facing Holborn Street and three ground floor retail units, 17 apartments and 19 car parking spaces facing Markievicz Road.’
      • ‘This impressive duplex apartment lies in an exclusive development that enjoys a prime coastal position and well-tended communal gardens.’
      • ‘This two bedroom duplex apartment has a private entrance hall and retains original Victorian features including high ceilings, decorative architraves and period fireplaces.’
  • 2(of paper or board) having two differently coloured layers or sides.

    • ‘For a duplex sheet, two video images are received.’
    • ‘Finding an optimal schedule for general sheet sequences (e.g., with mixed simplex and duplex sheets in the same document) is still exponential.’
    • ‘For instance, a mark engine module controller may export exactly two functions, namely printing a simplex or duplex sheet.’
    • ‘However, newer machines can deliver documents either face-up or face-down, and thus simplex sheets are sometimes inverted, while duplex sheets sometimes are not inverted after the second image transfer.’
    1. 2.1 (of a printer or its software) capable of printing on both sides of the paper.
      • ‘Do you need a printer with duplex printing capability (the ability to print on both sides of the paper automatically)?’
      • ‘In order to simultaneously output and input a waveform, the sound card (or sound chip integrated on to the motherboard) must be capable of full duplex operation.’
      • ‘There are a number of innovative features, such as single-pass duplex scanning, which can cut your print runs in half.’
      • ‘All of the printers in the new system can handle duplex printing.’
      • ‘Then we started arguing about how the printer managed to do duplex printing.’
  • 3(of a communications system, computer circuit, etc.) allowing the transmission of two signals simultaneously in opposite directions.

    • ‘Twenty-one switches are interconnected in a tree topology, with Fast Ethernet trunking, providing 200 Mbps full duplex communication paths.’
    • ‘It, on the other hand, can support full duplex communications.’
    • ‘SAS supports dual-port and full duplex communication between servers and disk drives.’
    • ‘These products are high-performance, fully integrated duplex data links for bi-directional comms in fibre channel and other datacom applications.’
    • ‘The duplex circuit, developed in Germany, made it possible for messages to travel simultaneously in opposite directions on the same line.’
    • ‘While disk drives have some full duplex capability, they typically can only be transferring user data in a single direction at a time.’
    • ‘The cable TV system is not upgraded to support duplex data transfer right now.’
    • ‘While it offers interesting features like full duplex capability which allows callers to interrupt one another over IP - what is most impressive about the product is its clarity and lack of delay.’
    • ‘An adaptive electronic transmission signal cancellation circuit separates transmit data from receive data in a bidirectional communication system operating in full duplex mode.’
    • ‘To achieve high-quality IP telephony communications, a gateway must send a full duplex stream of small data packets in real time to satisfy the time division multiplexed telephony interface.’
    • ‘This combination of features enables the user to hear and be heard in even the noisiest environments, while its full duplex communication technology ensures a natural flowing conversation.’
    • ‘And those attributes are really ones of performance, in terms of the increased link speed, the dual-ported capability of the interface, and the full duplex nature of the interface.’
    • ‘These cables are either duplex, triplex, or quadruplex, consisting of one, two or three insulated conductors wrapped around a bare aluminum or ACSR neutral.’
    • ‘This is because, unlike the regular duplex voice service, it need only be pseudo-realtime.’
    • ‘An adaptive electronic transmission signal cancellation circuit for separating transmit data from receive data in a bidirectional communication system operating in full duplex mode is disclosed.’
    • ‘If proper operation ensues, the port remains configured for full duplex transmission.’
    • ‘When the error condition is detected, the port commences full duplex operation in a third operational state, based on the presumption that device at the other end of the link may be configured for fixed full duplex operation.’
    • ‘The duplex audio would allow officers to hear each other at the far ends of the county and the dispatcher, even if they were talking, to hear an officer who began to transmit in contention.’


Mid 16th century (as an adjective): from Latin duplex, duplic-, from duo ‘two’ + plicare ‘to fold’. The noun dates from the 1920s.