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.
Report Abuse. MB means megabytes. KB means kilobytes. 1,000 KB equals to 1 MB. KB has a smaller value than MB and GB (gigabytes} has a bigger value than MB. Example, when you download a Video file, it will tell you whether its in KB or MB. The file in MB will be larger than the one in KB and it will take more space and more time downloading.In KB it is the reverse. Source(s): http://wiki.answers.com/Q/What_do_MB_and...