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.
â¢ MB (noun) The noun MB has 2 senses: 1. a unit of information equal to one million (1,048,576) bytes. 2. (a British degree) a bachelor's degree in medicine. Familiarity information: MB used as a noun is rare.