Definition of triplex in English:

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Pronunciation: /ˈtripleks/
Pronunciation: /ˈtrīˌpleks/


1North American A building divided into three self-contained residences.
Example sentences
  • The certificate is currently only required for triplexes and apartments.
  • He said he wants to see a moratorium on housing demolition and the construction of triplexes until the impact of the increased density allowances are better understood by council and area residents.
  • The pony-tailed property owner had previously bought and sold properties without incident and had successfully bid on two triplexes in the Pointe.
1.1An apartment or other residence on three floors.
Example sentences
  • The local health department issues permits for systems serving single-family homes, duplexes, or triplexes.
  • The pony-tailed property owner had previously bought and sold properties without incident and had successfully bid on two triplexes in the Pointe.
  • We were looking for a duplex or a triplex, but triplexes are really hard to come across.
1.2A movie theater with three separate screening rooms.
Example sentences
  • Although it closed down in 1980, it was reopened as a triplex in 1985 by Landmark Theatres, the nation's largest art-house theater circuit.
  • It's a triplex (three theatres in one building) with each theatre being fairly small; certainly smaller than your standard theatre.
2 Biochemistry A triple-stranded polynucleotide molecule.
Example sentences
  • Later it was found that homopurine strands can also specifically form a DNA triplex in which the AT base pair is contacted by an A and the GC base pair by a G.
  • The inverted repeat sequences of the guanine-rich 5'-half are expected to have a higher potential of forming the hairpin triplex.
  • This involves formation of a hybrid triplex by two PNA strands and a homopurine strand of dsDNA whereas the other DNA strand is displaced from the double helix.


Having three parts, in particular (of a residence) on three floors: his vast triplex apartment
More example sentences
  • ‘We have to have great conditions, but with 45 holes, including a 9-hole executive course, I need more efficiency than I would get with triplex mowers,’ he says.
  • For example, we have duplicate platforms in the triplex mowers but we have to target that while retaining functionality for all the markets.
  • But specific features such as bedknife-to-reel knobs on the walk-behinds and an offset cutting-unit design on the triplex mowers can ensure you get the best cut possible.


(be triplexed)
(Of electrical equipment or systems) be provided or fitted in triplicate so as to ensure reliability.
Example sentences
  • Diplexed and triplexed types have a single cable input which is selectively split to the outlet sockets.
  • A single coaxial feed runs from the riser switch to the lounge triplexed plate with an extension to the Master Bedroom.
  • Although it was triplexed in 1982, the interior was mostly preserved.


Early 17th century (as an adjective in the sense 'threefold'): from Latin, 'threefold', from tri- 'three' + plicare 'to fold'. Current specific senses date from the 1920s.

For editors and proofreaders

Syllabification: tri·plex

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