- a unit of computer memory equal to exactly 1 024 000 bytes. Storage on floppy disks is traditionally stated in multiples of this unit, which has usually been called a "megabyte." But a megabyte should be 1 000 000 bytes, or with a binary understanding it should be 220 = 1 048 576 bytes, and this unit doesn't fit either convention.
Dictionary of units of measurement. 2015.