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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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Mega is always a great word to know.
So is doohickey. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
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Example Sentences
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Collins
World English Dictionary
mega (ˈmɛɡə)
 
—adj
slang extremely good, great, or successful
 
[C20: probably independent use of mega-]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.
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"High-speed computer stores 2.5 megabits" [headline in "Electronics" magazine, Oct. 1, 1957]
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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 definition

[ˈmɛgə]
  1. mod.
    large; serious. : Some mega beast boogied down to the front of the auditorium and started screaming.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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