definition of
MB

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

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

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

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