noun, plural centillions (as after a numeral) centillion.
a cardinal number represented in the U.S. by 1 followed by 303 zeros, and in Great Britain by 1 followed by 600 zeros.
amounting to one centillion in number.
Origin: Related forms
1850–55; < Latin cent(um) 100 + -illion (as in million, billion, etc.)
centillionth, adjective, noun