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WordNet (r) 3.0 (2006) (WordNet)

Mb
n 1: a unit of information equal to 1000 kilobits or 10^6
(1,000,000) bits [synonym: {megabit}, {Mbit}, {Mb}]
2: a unit of information equal to 1000 kilobytes or 10^6
(1,000,000) bytes [synonym: {megabyte}, {M}, {MB}]
3: a unit of information equal to 1024 kibibytes or 2^20
(1,048,576) bytes [synonym: {megabyte}, {mebibyte}, {M}, {MB},
{MiB}]
4: (a British degree) a bachelor's degree in medicine [synonym:
{Bachelor of Medicine}, {MB}]