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Definition of Mega-
1. Prefix. (context: originally) Very large, great. Denoting a size larger than usual. ¹
2. Prefix. 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. ¹
3. Prefix. (computing) Multiplying the unit to which it is attached by 220 (= 1,048,576, the binary round number closest to a million). ¹
4. Prefix. (context: computing, marketing) Multiplying the unit to which it is attached by 210 × 103 (= 1024,000, the binary round number closest to thousand). ¹
¹ Source: wiktionary.com
Medical Definition of Mega-
1.