quadrillion

 
Pronunciation: /kwɒˈdrɪljən/

cardinal number (plural quadrillions or (with numeral) )

  • a thousand raised to the power of five (1015).
  • dated, chiefly British a thousand raised to the power of eight (1024).

Derivatives

quadrillionth

ordinal number

Origin:

late 17th century: from French, from million, by substitution of the prefix quadri- 'four' for the initial letters