What is semi?

  • (noun): A trailer having wheels only in the rear; the front is supported by the towing vehicle.
    Synonyms: semitrailer
    See also — Additional definitions below


Semi- is a Latin prefix to a verb, noun, or adjective meaning "half". Some compounds formed with it are often abbreviated to simply "semi" in appropriate contexts:

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More definitions of "semi":

  • (noun): One of the two competitions in the next to the last round of an elimination tournament.
    Synonyms: semifinal