MB (Noun) — A unit of information equal to 1000 kilobits or 10^6 (1,000,000) bits.
MB (Noun) — A unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes.
MB (Noun) — A unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes.
MB (Noun) — (a British degree) a bachelor's degree in medicine.