1. A unit of information equal to 1000 megabytes or 10^9 (1,000,000,000) bytes
   "The new hard drive had a capacity of 500 gigabytes";
   - G, GB, gig [informal]
    
2. A unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes
   "The hard drive had a capacity of 500 gigabytes";
   - gibibyte, G, GB, GiB, gig [informal]

Derived forms: gigabytes

Type of: computer memory unit

Part of: TB, tebibyte, terabyte, TiB

Encyclopedia: Gigabyte