(US, modern British and Australian, short scale) A thousand trillion (logic: 1,000 × 1,000^4): 1 followed by fifteen zeros, 10¹⁵.

(figuratively, slang, hyperbolic) Any very large number, exceeding normal description.

plural of quadrillion

The ordinal form of the number one quadrillion.

The person or thing in the quadrillionth position. / One of a quadrillion equal parts of a whole.

(rare) By a multiple of one quadrillion; by a quadrillion times as much or as many.

(rare) By a factor of one quadrillion.

plural of quadrillionth

plural of quadrillionaire

Somebody whose wealth is greater than one quadrillion units of the local currency. / (by extension) An extremely wealthy person.