[ sem-ee-di-tacht, sem-ahy- ]
/ ˌsɛm i dɪˈtætʃt, ˌsɛm aɪ- /


partly detached.
of or relating to a house joined by a party wall to another house or row of houses.

Origin of semidetached

First recorded in 1855–60; semi- + detached
Related formssem·i·de·tach·ment, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for semi-detached

British Dictionary definitions for semi-detached


/ (ˌsɛmɪdɪˈtætʃt) /


  1. (of a building) joined to another on one side by a common wall
  2. (as noun)they live in a suburban semidetached
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for semi-detached



in reference to houses, 1845, from semi- + past participle of detach (v.).

The "Detached House" bears its peculiar characteristic on its front; it stands alone, and nothing more can be said about it; but with the "semi-detached house" there is a subtle mystery, much to be marvelled at. Semi-detached! Have the party-walls between two houses shrunk, or is there a bridge connecting the two, as in Mr. Beckford's house in Landsdown Crescent, Bath? A semi-detached house may be a house with a field on one side and a bone-boiling factory on the other. Semi-detached may mean half-tumbling to pieces. I must inquire into it. ["Houses to Let," in "Household Words," March 20, 1852]
Online Etymology Dictionary, © 2010 Douglas Harper