Wiktionary (0.00 / 0 votes) Rate this definition: ignorant (Adjective). Unknowledgeable or uneducated; characterized by ignorance. ignorant (Adjective). Ill-mannered, crude. His manner was at best off-hand, at worst totally ignorant.
1 Megabyte (MB), a measure of amount of information used, for example, to quantify computer memory or storage capacity. 2  Megabit (Mb, or properly: Mbit), a measure of amount of information.  MikroBitti (formerly MB), a Finnish computer magazine.
MB-a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes. megabyte, M. computer memory unit-a unit for measuring computer memory. kilobyte, kB, K-a unit of information equal to 1000 bytes. gigabyte, GB, G-a unit of information equal to 1000 megabytes or 10^9 (1,000,000,000) bytes.