One million (106). In computing, which is based on the binary (base-2) numbering system, mega- has a literal value of 1,048,576, which is the power of 2 (220) closest to one million. Abbreviation: m.
Prefix denoting multiplication by a million. For example, a megawatt (mw) is equivalent to a million watts.

1. Vast
2. Of the highest level of rank, excellence, or importance