1. (noun) sarin, GB
a highly toxic chemical nerve agent that inhibits the activity of cholinesterase
2. (noun) gilbert, Gb, Gi
a unit of magnetomotive force equal to 0.7958 ampere-turns
3. (noun) gigabit, Gbit, Gb
a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits
4. (noun) gigabyte, G, GB
a unit of information equal to 1000 megabytes or 10^9 (1,000,000,000) bytes
5. (noun) gigabyte, gibibyte, G, GB, GiB
a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes
6. (noun) Great Britain, GB
an island comprising England and Scotland and Wales
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Definitions of GB 
