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.
Also see Kilo, mega, giga, tera, peta, and all that. 1) As a measure of computer processor storage and real and virtual memory, a megabyte (abbreviated MB) is 2 to the 20th power bytes, or 1,048,576 bytes in decimal notation. Download this free guide.