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semi

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Semi
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sem⋅i

  [sem-ee, sem-ahy]
Use semi in a Sentence
–noun Informal.
1. semitrailer (def. 1).
2. Often, semis. semifinal (def. 3).
Origin:
by shortening
Semi
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semi-

 
a combining form borrowed from Latin, meaning “half,” freely prefixed to English words of any origin, now sometimes with the senses “partially,” “incompletely,” “somewhat”: semiautomatic; semidetached; semimonthly; semisophisticated.
Origin:
ME < L sēmi-; c. OE sōm-, sām- half (mod. dial. sam-), OHG sāmi-, Skt sāmi-, Gk hēmi-; cf. sesqui-

Usage note:
See bi- 1 .

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
sem·i   (sěm'ī, sěm'ē)   
n.   pl. sem·is Informal

    1. A semitrailer.

    2. A tractor-trailer.

  2. 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

semi- 
from L. semi- "half," from PIE *semi- (cf. Skt. sami "half," Gk. hemi- "half," O.E. sam-, Goth. sami- "half"). O.E. cognate sam- was used in such compounds as samhal "poor health," lit. "half-whole;" samsoden "half-cooked," figuratively "stupid" (cf. half-baked); samcucu "half-dead," lit. "half-alive;" and the last survivor of the group, sand-blind "dim-sighted" (q.v.). The Latin-derived form has been common in forming native words since 15c.

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

semi- pref.

  1. Half: semicanal.

  2. Partial; partially: semiconscious.

  3. Resembling or having some of the characteristics of: semilunar.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

semi
/se'mee/ or /se'mi:/ A spoken abbreviation for semicolon.
"Commands to grind are prefixed by semi semi star" means that the prefix is ";;*", not 1/4 of a star.
[The Jargon File]
(1995-01-31)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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Abbreviations & Acronyms
semi

  1. semifinal

  2. semitrailer

SEMI
subendocardial myocardial infarction
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
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