Definition of "giga-" []

• One billion (109): gigahertz. (prefix)
• 1,073,741,824 (230): gigabyte. (prefix)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Connolly wrote to the collaboration members that the database at the Space Telescope Science Institute was only 100 gigabytes—“giga-” means “billion”—and a search took five hours."
• "Kilo-, mega-, giga- and tera- are prefixes used with bit or byte to measure capacities."