1) Certain quantity of data 2) Digital information unit 3) One million bits 4) Quantity of computer data 5) Quantity of data 6) Storage unit 7) Unit 8) Unit of information 9) Unit of measurement 
The megabit is a multiple of the unit bit for digital information or computer storage. The prefix mega (symbol M) is defined in the International System of Units (SI) as a multiplier of 106 (1 million), and therefore The megabit has the unit symbol Mb or Mbit. The megabit is closely related to the mebibit, a unit multiple derived from the binary p...
One million binary pieces (bits) of information. 
[n] - one million bits
A million bits.
noun one million bits