/ Dictionary / Index G gigabyte: Meaning and Definition of Find definitions for: gig•a•byte Pronunciation: (gig'u-bīt", jig'-), [key] — n. Computers. a measure of storage capacity equal to 1 billion (10) bytes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gigabyte (Thesaurus) gigabit gigacycle Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language