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mega-

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
mega-
pref.
1. Large: megadose.
2. Surpassing other examples of its kind; extraordinary: megahit.
3. One million (106): megahertz.

[Greek, from megas, great; see meg- in Indo-European roots.]

mega-
combining form
1. denoting 106: megawatt
2. (in computer technology) denoting 220 (1 048 576): megabyte
3. large or great: megalith
4. Informal very great: megastar [Greek megas huge, powerful]

mega-
1. A prefix that means:
2. Large, as in megadose, a large dose.
3. One million, as in megahertz, one million hertz.
4. 220 (that is, 1,048,576), which is the power of 2 closest to a million, as in megabyte.

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