gigabytePronunciation: /ˈgɪgəbʌɪt, ˈdʒ-/ (abbreviation: Gb or GB)Translate gigabyte | into German | into Spanish Definition of gigabyte noun Computing a unit of information equal to one thousand million (109) or, strictly, 230 bytes. gigabyte in other Oxford dictionaries Definition of gigabyte in the US English dictionary