Meaning of “mega” in the English Dictionary

"mega-" in American English

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us /ˈmeɡ·ə/

used to add the meaning "extremely big" or "a large amount" to nouns:

His last movie made him a megastar.
They’re making megabucks (= a lot of money).

(Definition of “mega-” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"mega-" in Business English

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uk /meɡə-/ us

MEASURES used before nouns to mean one million

used before adjectives and nouns to mean "very" or "very big":

mega-rich bankers

megaadjective [ usually before noun ]

uk /ˈmeɡə/ us

informal extremely large or important:

It is now likely that eight Las Vegas-style mega casinos will go ahead.

(Definition of “mega-” from the Cambridge Business English Dictionary © Cambridge University Press)