/ Dictionary / Index M megacycle: Meaning and Definition of Find definitions for: meg•a•cy•cle Pronunciation: (meg'u-sī"kul), [key] — n. a unit of frequency, equal to one million cycles per second; megahertz. The term megahertz is now preferred in technical use. Abbr.: Mc, mc Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: megacycle (Thesaurus) megacorporation megadeal Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language