gigabyte

1. (computing, formal) One billion (10⁹, or 1,000,000,000) bytes or 1,000 megabytes.Examples: "The IBM 3380 Direct Access Storage is a disk storage device with a storage capacity of 2.5 gigabytes (billion bytes) per unit, an increase of almost four times the capacity of the IBM 3350 Direct Access Storage."; "It does not take much effort these days to accumulate several hundred gigabytes of data. A few hundred songs, a couple of vacations’ worth of photos, a dozen movies and television programs — and suddenly the 80 gigabyte hard drive in the notebook computer is straining."; "In that trial, new customers can buy plans with a 5-gigabyte cap, a 20-gigabyte cap or a 40-gigabyte cap. Prices for those plans range from $30 to $50. Above the cap, customers pay $1 a gigabyte. Plans with higher caps come with faster service."formal

2. (computing, informal) A gibibyte.informal