Definitions for quintillionkwɪnˈtɪl yən
Random House Webster's College Dictionary
quin•til•lionkwɪnˈtɪl yən(n.)(pl.)-lions; -lion
(n.)a cardinal number represented in the U.S. by 1 followed by 18 zeros, and in Great Britain by 1 followed by 30 zeros.
(adj.)amounting to one quintillion in number.
Origin of quintillion:
1665–75; < L quīnt(us)fifth+-illion (as in million)
the number that is represented as a one followed by 18 zeros
Any very large number, exceeding normal description.
Origin: ; ie the fifth power of a million, 10.