Meg- Meg·a Meg·a·lo-. Combining forms signifying: (a) Great, extended, powerful; as, megascope, megacosm. (b) Metric System, Elec., Mech., etc. A million times, a million of; as, megabyte, a million butes; megawatt, a million watts; megameter, a million meters; megafarad, a million farads; megohm, a million ohms.
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