| Noun | 1.Mb - a unit of information equal to 1000 kilobits or 10^6 (1,000,000) bitsMbit, megabitcomputer memory unit - a unit for measuring computer memorykb, kbit, kilobit - a unit of information equal to 1000 bitsGbit, gigabit, Gb - a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits | | 2.MB - a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytesmegabyte, Mcomputer memory unit - a unit for measuring computer memorykilobyte, kB, K - a unit of information equal to 1000 bytesgigabyte, GB, G - a unit of information equal to 1000 megabytes or 10^9 (1,000,000,000) bytes | | 3. MB - a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytesmebibyte, MiB, megabyte, Mcomputer memory unit - a unit for measuring computer memoryKiB, kibibyte, kilobyte, kB, K - a unit of information equal to 1024 bytesGiB, gibibyte, gigabyte, GB, G - a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes | | 4. MB - (a British degree) a bachelor's degree in medicineBachelor of Medicinebachelor's degree, baccalaureate - an academic degree conferred on someone who has successfully completed undergraduate studiesBritain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom |