• (RP) IPA: /ˈsɛmi/
  • (America) IPA: /ˈsɛmi/, /ˈsemaɪ/

semi (plural semis)

  1. (UK, Ireland, Australia, Canada, informal) A semi-detached house.
    • 2008, Elliott Placks, quoted in Helen Isbister, Morris Bryant, Property, Career FAQs, Australia, [ page 40],
      I′m selling two side-by-side semis that are currently under construction, a waterfront apartment and a house in Rose Bay.
    • 2008, Barry Goodchild, Homes, Cities and Neighbourhoods: Planning and the Residential Landscapes of Modern Britain, [ page 52],
      The smaller semis of the 1920s and 1930s were closely related to the three bedroom pre-1919 narrow fronted terraces, at least to the larger pre-1919 terraces.
  2. (Australia, Canada, New Zealand, United States) A semitrailer; a tractor-trailer; an eighteen-wheeler; an artic.
    • 2011, Eamonn Duff, Schapelle Corby: The Untold Story Behind Her Ill-Fated Drug Run, Allen & Unwin, Australia, [ unnumbered page],
      All night we couldn′t hear each other speak because of the sound of semis changing gear to get over the hill.
  3. (informal) A semifinal.
  4. (slang) A partial erection.
    • 2010, Mickey Erlach, Video Boys (page 158)
      The twink got a semi just from that look.

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