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mega

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mega-

var. 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:
comb. form repr. Gk mégas large, great
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Slang Dictionary
mega [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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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). 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, © 2001 Douglas Harper
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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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