— octillionth , n. , adj.
/ok til"yeuhn/ , n. , pl. octillions , ( as after a numeral ) octillion , adj.
n.
1. a cardinal number represented in the U.S. by 1 followed by 27 zeros, and in Great Britain by 1 followed by 48 zeros.
adj.
2. amounting to one octillion in number.
[ 1680-90; oct- OCT- + -illion, as in million ]