Quadrillion

n.

1.

According to the French notation, which is followed also upon the Continent and in the United States, a unit with fifteen ciphers annexed; according to the English notation, the number produced by involving a million to the fourth power, or the number represented by a unit with twenty-four ciphers annexed. See the Note under Numeration.

Noun	1.	quadrillion - the number that is represented as a one followed by 24 zeros; "in England they call a septillion a quadrillion"
	2.	quadrillion - the number that is represented as a one followed by 15 zeros

a billion, a crore, a lakh, a million, a myriad, a nonillion, a quadrillion, a thousand, a zillion, decillion, duodecillion, googol, googolplex, jillion, nonillion, novemdecillion, octillion, octodecillion, quattuordecillion, quindecillion, quintillion, septillion, sexdecillion, sextillion, tredecillion, trillion, undecillion, vigintillion, zillion