n. (pl. same or quintillions) a thousand raised to the sixth (or formerly, esp. Brit., the tenth) power (10(18) and 10(30) respectively). quintillionth adj. & n.
[ L quintus fifth + MILLION ]
QUINTILLION
Meaning of QUINTILLION in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012