gigabyte gig‧a‧byte [ˈgɪgəbaɪt] written abbreviation Gb noun [countable]
COMPUTING a unit of computer information equal to one thousand million byte S:

• disks that can hold up to 96 gigabytes of data

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gigabyte UK US /ˈgɪgəbaɪt/ noun [C] (ABBREVIATION GB, INFORMAL gig)
IT a unit of computer information, consisting of 1024 megabytes: »

One gigabyte can hold just over 16 hours of standard MP3™ files.

Financial and business terms. 2012.