"gigabyte" in the noun sense
1. gigabyte, G, GB
a unit of information equal to 1000 megabytes or 10^9 (1,000,000,000) bytes
2. gigabyte, gibibyte, G, GB, GiB
a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes
Source: WordNet® (An amazing lexical database of English)
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