gig ‧ a ‧ byte /ˈɡɪɡəbaɪt/ BrE AmE noun [countable] ( written abbreviation GB or Gb )
[ Date: 1900-2000 ; Language: Greek ; Origin: gigas ( ⇨ ↑ gigantic ) + English byte ]
a unit for measuring computer information, equal to 1,024 ↑ megabyte s , and used less exactly to mean a ↑ billion bytes