Definition of mega- combining form from the Oxford Advanced American Dictionary

     

    mega-

     combining form
    combining form
    NAmE//ˈmɛɡə//
     
     
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  1. 1(in nouns)
  2. 2very large or great a megastore
  3. 3(in units of measurement) one million a megawatt
  4. 4(computing) 1 ,048, 576 (= 22⁰) megabyte
See the Oxford Advanced Learner's Dictionary entry: mega-

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