definition of
Mb

[1] #1 Mb n. [megabit, Mbit] a unit of information equal to 1000 kilobits or 10^6 (1,000,000) bits. wn

[2] #2 Mb n. [megabyte, M, MB] a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes. wn

[3] #3 Mb n. [megabyte, mebibyte, M, MB, MiB] a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes. wn

[4] #4 Mb n. [Bachelor of Medicine, MB] (a British degree) a bachelor's degree in medicine. wn