What is the meaning of Mega?

Very large.

Great; excellent.

extremely

A megararity (extremely rare bird for a certain region).

The Steinhaus-Moser number

very

Romanization of ᬫᬾᬖ.

to be able to

must, may

Clipping of megabyte.

million

very

millionth

must, may

Ellipsis of megatavu (megabyte).

Ellipsis of megabitti (megabit).

very, super

awesome, amazing

to be allowed, to be permitted, to may

must, to have to

to have the strength, to be able

cloud (visible mass of water droplets suspended in the air)

Dated spelling of méga.

cloud (visible mass of water droplets suspended in the air)

awesome, great, cool

awesome, great, cool

very, super (intensifier)

Clipping of megabyte.

Clipping of mega hair.

Clipping of megabyte.

feminine singular of mego

Romanization of ᮙᮦᮌ (cloud)

Source: wiktionary.org