noun (n)

• a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes(noun.quantity)

  Synonym:
  m, mb
  

  source: wordnet30
• a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes(noun.quantity)

  Synonym:
  m, mb, mebibyte, mib
  

  source: wordnet30