from The Century Dictionary.

  • A prefix of Latin origin, meaning ‘half’: much used in English in the literal sense, and, more loosely, to mean ‘in part, partly, almost, largely, imperfectly, incompletely.’

from the GNU version of the Collaborative International Dictionary of English.

  • A prefix signifying half, and sometimes partly or imperfectly.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • prefix half
  • prefix partial, incomplete
  • prefix somewhat, rather, quasi-

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

  • noun a trailer having wheels only in the rear; the front is supported by the towing vehicle
  • noun a truck consisting of a tractor and trailer together
  • noun one of the two competitions in the next to the last round of an elimination tournament


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin semi- ("half").


Help support Wordnik (and make this page ad-free) by adopting the word semi-.


  • On the other hand, the semi- conductor industry is relatively insensitive to shipping costs.

    Mark Sunshine: The Small Silver Lining of $100 Oil Mark Sunshine 2011

  • He beamed, thrown a bone by my use of the semi-"technical" term, "sequeing" . . . though, truth be told—"Glad to see you're coming along."

    Portland Music Listener [Card #5: The Heirophant] (WORK-IN-PROGRESS) Christopher Snyder 2011

  • That sour history leaves Islamism as the last big idea standing—and standing at a moment when tens of millions of young Muslims find themselves undereducated, semi- or unemployed, and uniquely receptive to a world view with deep historic roots and heroic ambitions.

    Why Islamists Are Winning Bret Stephens 2011

  • The administration declined to brand China as a currency manipulator in its semi- annual report to Congress in December. -- Top News 2012

  • The disagreement marked the second day of the IMF's semi- annual meetings which drew policy makers from the lender's 187- nation membership to Washington. -- Top News 2011

  • Lang, who said nine out of 10 captured pirates are released because there isn't sufficient capacity to prosecute or incarcerate them, recommended establishment of specialized courts in semi- autonomous Somaliland and Puntland, and a third with Somali jurisdiction in Tanzania. -- Top News 2011

  • Panoro Energy ASA PEN signed a rig contract with a unit of Transocean for the GSF Arctic I semi- submersible drilling rig to drill three wells on blocks BM-S-63, BM-S-71 and BM-S-72, in the Santos Basin offshore

    unknown title 2011

  • Including newbuildings, the Company has a fleet of 72 vessels, including 28 crude oil tankers VLCC and Suezmax, two chemical tankers, five oil/bulk/ore vessels, 12 drybulk carriers including seven newbuildings, 15 container vessels, six offshore supply vessels, one jack-up drilling rigs, one ultra-deepwater drillship and two ultra-deepwater semi- submersible drilling rigs.

    unknown title 2011

  • The semi- autonomous Indian Ocean island nation is in a political union with Tanzania. -- Top News 2011

  • Arsenal and Manchester United face fines over Champions League semi- Champions League draw becomes a six nations event as Uefa gets lucky Bayern Munich coach asks Uefa to intervene over Lyon postponement

    The Guardian World News Owen Gibson 2011


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