/ Dictionary / Index G gigacycle: Meaning and Definition of Find definitions for: gi•ga•cy•cle Pronunciation: (gig'u-sī"kul, jig'-), [key] — n. one billion cycles. Abbr.: Gc Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gigacycle (Thesaurus) gigabyte gigaelectron volt Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language