/ Dictionary / Index S sexdecillion: Meaning and Definition of Find definitions for: sex•de•cil•lion Pronunciation: (seks"di-sil'yun), [key] — n., pl. adj. -lions, -lion, —n. a cardinal number represented in the U.S. by 1 followed by 51 zeros, and in Great Britain by 1 followed by 96 zeros. —adj. amounting to one sexdecillion in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sex chromosome sexed Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language