mega-

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, meg, mega, mega-, megabacterium, megabit, megabladder, megabuck, megabyte

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for mega-

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.