— sextillionth , adj. , n.
/seks til"yeuhn/ , n. , pl. sextillions , ( as after a numeral ) sextillion , adj.
n.
1. a cardinal number represented in the U.S. by 1 followed by 21 zeros, and in Great Britain by 1 followed by 36 zeros.
adj.
2. amounting to one sextillion in number.
[ 1680-90; sext ( us ) SIXTH + -illion, as in MILLION ]