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Definition of mega adjective from the Oxford Advanced Learner's Dictionary

mega

adjective
 
/ˈmeɡə/
 
/ˈmeɡə/
[usually before noun] (informal)
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  1. very large or impressive synonym huge, great
    • The song was a mega hit last year.
    Word Origin1980s: independent usage of mega-.
See mega in the Oxford Advanced American Dictionary

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halfway
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