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[kwo-dril-yuh n] /kwɒˈdrɪl yən/

noun, plural quadrillions (as after a numeral) quadrillion.
a cardinal number represented in the U.S. by 1 followed by 15 zeros, and in Great Britain by 1 followed by 24 zeros.
amounting to one quadrillion in number.
(in Britain) the number represented as one followed by 24 zeros (1024) US and Canadian word septillion
(in the US and Canada) the number represented as one followed by 15 zeros (1015)


1670s, from French quadrillion (16c.) from quadri- “four” (see quadri-) + (m)illion. Cf. billion. In Great Britain, the fourth power of a million (1 followed by 24 zeroes); in the U.S., the fifth power of a thousand (1 followed by 15 zeroes).


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