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

     

    mega-

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