meg-

mega-

variant of megalo- (megalith ); also the initial element in units of measure that are equal to one million of the units denoted by the base word (megahertz ). Symbol: M
Also, especially before a vowel, meg-.


Origin:
combining form representing Greek mégas large, great

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World English Dictionary
mega-
 
combining form
1.  M denoting 106: megawatt
2.  (in computer technology) denoting 220 (1 048 576): megabyte
3.  large or great: megalith
4.  informal great in importance or amount: megastar
 
[from Greek megas huge, powerful]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

mega-
prefix, often meaning "large, great," but in precise scientific language "one million" (megaton, megawatt, etc.), from Gk. megas "great, large, mighty" (fem. megale), from PIE *meg- "great" (cf. L. magnus, Goth. mikils, O.E. micel; see mickle). Mega began to be used alone as an adj. 1982.
"High-speed computer stores 2.5 megabits" [headline in "Electronics" magazine, Oct. 1, 1957]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mega- pref.

  1. Large: megacephaly.

  2. One million (106): megahertz.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
mega-  
  1. A prefix that means:

  2. Large, as in megadose, a large dose.

  3. One million, as in megahertz, one million hertz.

  4. 220 (that is, 1,048,576), which is the power of 2 closest to a million, as in megabyte.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang Dictionary

mega-

/me'g*/ pref. [SI] See quantifiers.
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