51Թ

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View synonyms for

semi

1

[ sem-ee, sem-ahy ]

semi-

2
  1. 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.

semi

1

/ ˈɛɪ /

noun

  1. a semidetached house
  2. short for semifinal
  3. short for semitrailer
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

semi-

2

prefix

  1. half Compare demi- hemi-

    semicircle

  2. partially, partly, not completely, or almost

    semifinal

    semiprofessional

  3. occurring twice in a specified period of time

    semiannual

    semiweekly

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

𳾾–

  1. A prefix that means “half,” (as in semicircle, half a circle) or “partly, somewhat, less than fully,” (as in semiconscious, partly conscious).
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Confusables Note

See bi- 1.
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51Թ History and Origins

Origin of semi1

By shortening

Origin of semi2

Middle English < Latin ŧ-; cognate with Old English sōm-, sām- half (modern dial. sam- ), Old High German 峾-, Sanskrit 峾-, Greek ŧ-; sesqui-
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51Թ History and Origins

Origin of semi1

from Latin; compare Old English sōm-, sām- half, Greek ŧ-

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51Թs That Use semi-

What does semi- mean?

Semi– is a combining form used like a prefix meaning “half.” In some instances, it is used figuratively to mean “partially,” “incompletely,” or “somewhat.” It is often used in a variety of technical and everyday terms.

Semi– comes from Latin ŧ-, meaning “half.” The Greek cognate of ŧ– is ŧ-, also meaning “half,” which is the source of English terms such as hemialgia and hemicardia. To learn more, check out our entries for both words.

Examples of semi-

An example of a word you may have encountered that features semi– is semicolon, “the punctuation mark (;).”

We know semi– means “half,” and a colon is the sign (:). The word colon itself comes from Greek ôDz, meaning “limb; part of a clause or period.” Semicolon literally translates to “half colon.”

What are some words that use the combining form semi-?

What are some other forms that semi– may be commonly confused with?

Break it down!

The word literate means “able to read and write.” With this in mind, what does semiliterate mean?

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