- A metric prefix representing 106, which is equal to a million. For instance, 1 megahertz is equal to 106 Hz, or 1,000,000 Hz. When referring to binary quantities, such as bits and bytes, it is equal to 220, or 1,048,576, although this is frequently rounded to 1,000,000. To avoid any confusion, the prefix mebi- may be used when dealing with binary quantities. Its abbreviation is M.
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