Mega (prefix)

1. Very large or great in size, amount, or extent.
2. One million (used with units of measurement).

Origin:

From ancient greek μέγας (mégas, “great, large”).

Examples:

1. The company unveiled its mega-store, which covers more than 10,000 square meters.
2. The event drew a mega-crowd of over 1 million people.
3. The company earned a mega-profit of $10 million last year.
4. The power plant has a capacity of 100 megawatts.
5. The telescope can observe objects that are billions of light years away, thanks to its mega-light-gathering power.