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variant of (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.
(slang) extremely good, great, or successful
combining form
denoting 106: megawatt, M
(in computer technology) denoting 220 (1 048 576): megabyte
large or great: megalith
(informal) great in importance or amount: megastar

before vowels meg-, word-forming element often meaning “large, great,” but in precise scientific language “one million” (megaton, megawatt, etc.), from Greek megas “great, large, vast, big, high, tall; mighty, important” (fem. megale), from PIE *meg- “great” (cf. Latin magnus, Old English micel; see mickle). Mega began to be used alone as an adjective by 1982.

High-speed computer stores 2.5 megabits [headline in “Electronics” magazine, Oct. 1, 1957]

mega- pref.



Much: I got mega homework tonight


Very: This dude is mega gross (1980s+ Students & teenagers)


A very large specimen, quantity, etc, of what is indicated: megabitch/ megablitz/ mega-cost/ megafame/ megagreed/ megahopes/ megamodel/ mega-travel (1981+)


Read Also:

  • Megabacterium

    megabacterium meg·a·bac·te·ri·um (měg’ə-bāk-tǐr’ē-əm) n. A bacterium of unusually large size.

  • Megabit

    [meg-uh-bit] /ˈmɛg əˌbɪt/ noun, Computers. 1. 2 20 (1,048,576) . 2. (loosely) one million . Abbreviation: Mb. /ˈmɛɡəˌbɪt/ noun (computing) 1. one million bits 2. 220 bits megabit (měg’ə-bĭt’)

  • Megabits per second

    unit (Mbps, Mb/s) Millions of bits per second. A unit of data rate. 1 Mb/s = 1,000,000 bits per second (not 1,048,576). E.g. Ethernet can carry 10 Mbps. (2002-03-23)

  • Megabladder

    megabladder meg·a·blad·der (měg’ə-blād’ər) n. See megalocystis.

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