From Ancient Greek μέγας (megas, “great, large, mighty”), from Proto-Indo-European *meg- (“great”). Cognate with Latin magnus, and with Germanic words: Gothic 𐌼𐌹𐌺𐌹𐌻𐍃 (mikils), Old English micel, Middle English muchel, English much, Old High German mihhil, Old Norse mikill, Danish meget.
- (originally) Very large, great. Denoting a size larger than usual.
- In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by one million (106.) SI Symbol: M, computing abbreviation: Mi.
- (computing) Multiplying the unit to which it is attached by 220 (= 1,048,576, the binary round number closest to a million).
- (computing, marketing) Multiplying the unit to which it is attached by 210 × 103 (= 1024,000, the binary round number closest to thousand).
Usage notes 
- also written separately as an adjective, meaning very large or great; (see mega).
- Because the meaning "220" is in conflict with the meaning "one million" used with SI units, the alternative mebi- has been proposed, with Mi proposed for use with SI units and M in computing. This sense is US only not widely used.
Derived terms 
Related terms 
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- mega- (all senses)