Definition of megabyte noun from the Oxford Advanced American Dictionary

 

megabyte

 noun
noun
NAmE//ˈmɛɡəˌbaɪt//
 
(abbreviation MB)(informal)(abbreviation meg)
 
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a unit of computer memory, equal to 22⁰ (or about 1 million) bytes a 512-megabyte flash drive
See the Oxford Advanced Learner's Dictionary entry: megabyte