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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-


See bi- 1 .
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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semi-  
pref.  
  1. Half: semicircle.

  2. Partial; partially: semiconscious.

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

  4. Occurring twice during: semimonthly. See Usage Note at bi-1.


[Middle English, from Latin sēmi-, half; see sēmi- in Indo-European roots.]
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.
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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Science Dictionary
semi-  
A prefix that means "half," (as in semicircle, half a circle) or "partly, somewhat, less than fully," (as in semiconscious, partly conscious).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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