/ Dictionary / Index N nonillion: Meaning and Definition of Find definitions for: no•nil•lion Pronunciation: (nō-nil'yun), [key] — n., pl. adj. -lions, -lion, —n. a cardinal number represented in the U.S. by 1 followed by 30 zeros, and in Great Britain by 1 followed by 54 zeros. —adj. amounting to one nonillion in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nonideal nonimportation Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language