Definition of quadrillion number from the Oxford Advanced Learner's Dictionary

 

quadrillion

 number
number
BrE BrE//kwɒˈdrɪljən//
 
; NAmE NAmE//kwɑːˈdrɪljən//
 
 
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the number 1015, or 1 followed by 15 zeros Word Origin late 17th cent.: from French, from million, by substitution of the prefix quadri- ‘four’ for the initial letters.
See the Oxford Advanced American Dictionary entry: quadrillion