Longman Dictionary of Contemporary English homepage

Language: Greek
Origin: megas 'large'

mega-

 prefix
     
mega-
1 [in nouns] a million - used with units of measurement:
1000 megawatts of electricity
2 informal extremely:
Her family is megarich!
3 very big:
a megastore
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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