Sextillion is a number equal to a 1 followed by 21 zeros.(noun)
1,000,000,000,000,000,000,000 is an example of a sextillion.
See sextillion in Webster's New World College Dictionary
Origin: Fr < L sextus, sixth (< sex, six) + Fr (m)illion
See sextillion in American Heritage Dictionary 4
Origin: : Latin sextus, sixth; see sextile
Origin: + French -illion (as in million, million, from Old French milion; see million).
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