quadrillion quadrillion /kwɑːˈdrɪliən/

noun

1. The number that is represented as a one followed by 15 zeros  ( quadrillion )
   the number that is represented as a one followed by 15 zeros
   
2. The number that is represented as a one followed by 24 zeros  ( quadrillion )
   the number that is represented as a one followed by 24 zeros
    In England they call a septillion a quadrillion
   in England they call a septillion a quadrillion