mega-

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variant of megalo- (megalith); also the initial element in units of measure that are equal to one million of the units denoted by the base word (megahertz). Symbol: M

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Also especially before a vowel, meg-.

Origin of mega-

Combining form representing Greek mégas large, great

Words nearby mega-

mefenamic acid, meff, mefloquine, Mefoxin, meg, mega-, megabacterium, megabit, megabladder, megabuck, megabyte

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use mega- in a sentence

We have reached a tipping point where mega donors completely dominate the landscape.
The 100 Rich People Who Run America|Mark McKinnon|January 5, 2015|DAILY BEAST
And who can blame them for feeling disenfranchised when they see their efforts dwarfed by the mega donors.
The 100 Rich People Who Run America|Mark McKinnon|January 5, 2015|DAILY BEAST
Art Basel itself is but the center of a cluster of mega-shows taking place in Miami this week.
Sneer and Clothing in Miami: Inside The $3 Billion Woodstock of Contemporary Art|Jay Michaelson|December 6, 2014|DAILY BEAST
The FSLN-controlled legislative assembly approved the mega-project under a cloud of secrecy in a record seven days.
China’s Nicaragua Canal Could Spark a New Central America Revolution|Nina Lakhani|November 30, 2014|DAILY BEAST

Mary Matalin once dubbed him a “mega-multimedia Wunderkind!”
Ben Carson’s Bizarrely Serious, Seriously Bizarre Campaign Crew|Olivia Nuzzi|November 12, 2014|DAILY BEAST
Correspondingly, the merozoites, to which they give rise, are also different (micro-and mega-merozoites).
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5|Various
As this letter A is formed by a larger aperture than the former one, it may be called A mega.
The Temple of Nature; or, the Origin of Society|Erasmus Darwin.
I call him Mega-ergaton docile, 'the teachable great-worker.'
A Century of Science and Other Essays|John Fiske
They foresaw a multi-ethnic, multi-cultural socialist mega-state.
After the Rain|Sam Vaknin
The prime example is Japan, which constructed its whole mega-economy on these bases.
After the Rain|Sam Vaknin

British Dictionary definitions for mega- (1 of 2)

mega

/ (ˈmɛɡə) /

adjective

slang extremely good, great, or successful

Word Origin for mega

C20: probably independent use of mega-

British Dictionary definitions for mega- (2 of 2)

mega-

combining form

denoting 10 6megawatt Symbol: M

(in computer technology) denoting 2 20 (1 048 576)megabyte

large or greatmegalith

informal great in importance or amountmegastar

Word Origin for mega-

from Greek megas huge, powerful

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for mega-

mega-

pref.

Large:megacephaly.

One million (106):megahertz.

Scientific definitions for mega-

mega-

A prefix that means:

Large, as in megadose, a large dose.

One million, as in megahertz, one million hertz.

220 (that is, 1,048,576), which is the power of 2 closest to a million, as in megabyte.