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semi 's

 - 4 dictionary results

sem⋅i

[sem-ee, sem-ahy]
–noun Informal.
1. semitrailer (def. 1).
2. Often, semis. semifinal (def. 3).

Origin:
by shortening

sem⋅i⋅trail⋅er

[sem-i-trey-ler]
–noun
1. Also called semi. a detachable trailer for hauling freight, with wheels at the rear end, the forward end being supported by the rear of a truck tractor when attached. Compare full trailer.
2. tractor-trailer.

Origin:
1915–20; semi- + trailer
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To semi 's
sem·i   (sěm'ī, sěm'ē)   
n.   pl. sem·is Informal
    1. A semitrailer.

    2. A tractor-trailer.

  1. A semifinal.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

semitrailer 
1919, from semi- (q.v.) + trailer. Short form semi is attested from 1942.
Online Etymology Dictionary, © 2001 Douglas Harper
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