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2.
1. a number equal to 1,000,000,000,000,000 or 10^15.
There are a quadrillion grains of sand on this beach.
by 5'1"Racer February 12, 2005
33 223
 
1.
A quadrillion is a million, million, million, millions or 10^24 from quad for four, you see a quadbike does not have two and a half wheels, just as a tricycle does not have two wheels (...look up trillion).
A quadrillion dollars is a million, million, million, millions of dollars or $1, 000 000, 000 000, 000 000, 000 000.
by Repete456 December 28, 2009
363 59