noun (n)

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

  Synonym:
  mbit, megabit
  

  source: wordnet30
• a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes(noun.quantity)

  Synonym:
  m, megabyte
  

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

  Synonym:
  m, mebibyte, megabyte, mib
  

  source: wordnet30
• (a British degree) a bachelor's degree in medicine(noun.communication)

  Synonym:
  bachelor of medicine
  

  source: wordnet30