mega

1 of 2

adjective

ˈme-gə 

1

: vast

a mega electronics store

2

: of the highest level of rank, excellence, or importance

a number one hit made her mega

mega-

2 of 2

combining form

variants or meg-

1

a

: great : large

megaspore

b

: greatly surpassing others of its kind

megahit

2

: million (10⁶)

megohm

megacycle

Synonyms of mega

Adjective

• huge
• giant
• gigantic
• massive
• colossal
• vast
• enormous
• tremendous
• mammoth
• monumental
• astronomical
• immense
• bumper
• big
• monster
• titanic

Examples of mega in a Sentence

Adjective

an actor who has become a mega celebrity

I will never understand why people build those mega houses on tiny lots.

Recent Examples on the Web

Adjective

Nearly 40% of the S&P 500’s value is concentrated in mega-cap technology stocks like Nvidia, Microsoft (MSFT) and Alphabet (GOOG). —John Towfighi, CNN Money, 27 Feb. 2026

Combining all of those as one mega entity could be the means to keep these linear channels afloat, and maybe something like that is still on the table should Paramount look to do some more M&A shopping. —Brian Welk, IndieWire, 27 Feb. 2026

And in the last two and half decades, a mega drought and a changing climate have cut about 20% of that flow. —Pete McBride, Time, 27 Feb. 2026

There’s also a major concern that mega-cap companies, including Amazon , Meta , Microsoft , and Oracle , are spending too much on AI at the expense of profitability. —Paulina Likos, CNBC, 27 Feb. 2026

Word History

Etymology

Adjective

mega-

Combining form

Greek, from megas large — more at much

First Known Use

Adjective

1968, in the meaning defined at sense 1

Rhymes for mega

• omega

Kids Definition

mega-

combining form

variants or meg-

1

: great : large

megaspore

2

: million : multiplied by one million

megahertz

3

: to the highest or greatest degree

mega-successful

Etymology

Combining form

from Greek megas "large"