From Longman Dictionary of Contemporary Englishmegameg‧a /ˈmeɡə/ adjective informal BIGENJOY/LIKE DOING somethingvery big and impressive or enjoyable Their first record was a mega hit. —mega adverbmega-mega- /meɡə/ prefix 1 [in nouns] a million – used with units of measurement 1,000 megawatts of electricity2 informalLOT/LARGE NUMBER OR AMOUNT extremely Her family is megarich!3 very big a megastore
Examples from the Corpus
mega-• a 100-megaton bomb• Hollywood megastarsFrom Longman Business Dictionarymega-mega- /megə/ prefix journalism very big or very importantThree bank mega-mergers have been announced in the last two months.We are not looking for huge mega-returns on our investment.That’s the mega-decision the president has to make.Origin mega- Greek megas “large” 