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Mega (symbol M) is a SI prefix in the SI system of units denoting a factor of 106, ie one million; 1,000,000.

For example, a megawatt is 1,000,000 watts.

The prefix is sometimes applied in non-standard ways:

"Mega", one of the most recent additions to teenage argot. It substitutes for "cool", something I used 40 years ago as a kid. Nice to see a new term. "Wow! That's mega. Much mega."