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mega-

1.
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for mega-

mega-

combining form
1.
denoting 106 megawatt, M
2.
(in computer technology) denoting 220 (1 048 576) megabyte
3.
large or great megalith
4.
(informal) great in importance or amount megastar
Word Origin
from Greek megas huge, powerful
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
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Word Origin and History for mega-

before vowels meg-, word-forming element often meaning "large, great," but in precise scientific language "one million" (megaton, megawatt, etc.), from Greek megas "great, large, vast, big, high, tall; mighty, important" (fem. megale), from PIE *meg- "great" (cf. Latin magnus, Old English micel; see mickle). Mega began to be used alone as an adjective by 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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mega- in Medicine

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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mega- in Science
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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mega- in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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