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Definition of mega- combining form from the Oxford Advanced Learner's Dictionary

mega-

combining form
 
/meɡə/
 
/meɡə/
in nouns
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  1. very large or great
    • a megastore
  2. (in units of measurement) one million
    • a megawatt
  3. (computing) (in units of measurement) 220, or 1 048 576
    4. Word Originfrom Greek megas ‘great’.
See mega- in the Oxford Advanced American Dictionary
Check pronunciation: mega-

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ancient
adjective
 
 
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