mega-🔊

(originally) Very large, great.

(Q107205) In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by one million (106).

(computing) Multiplying the unit to which it is attached by 220 (= 1,048,576, the binary number closest to a million). Computing symbol: Mi.

(computing, marketing) Multiplying the unit to which it is attached by 210 × 103 (= 1,024,000, the binary round number closest to a million).

(augmentative) Really, very, uber-, super-.