Definition of gigabyte noun from the Oxford Advanced American Dictionary

 

gigabyte

 noun
noun
NAmE//ˈɡɪɡəˌbaɪt//
 
(informal gig)(abbreviation GB)(computing)
 
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a unit of computer memory, equal to 23⁰ (or about a billion) bytes
See the Oxford Advanced Learner's Dictionary entry: gigabyte