- noun storage unit in computers, equal to 1,048,576 bytes.
- noun a measure of the data capacity of a storage device that is equal to 1,048,576 bytes or 220 bytes. Megabytes are used to measure the storage capacity of hard disk drives or main memory (RAM).
- 220, or 1,048,576 bytes, although this is frequently rounded to a million. To avoid any confusion, the term mebibyte may be used when referring to this concept. Its abbreviation is MB, or Mbyte.