English

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

 

septillion

 number
number
BrE BrE//sepˈtɪljən//
 
; NAmE NAmE//sepˈtɪljən//
 
 
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the number 1024, or 1 followed by 24 zeros Word Origin late 17th cent.: from French, from million, by substitution of the prefix septi- ‘seven’ (from Latin septimus ‘seventh’) for the initial letters.
See the Oxford Advanced American Dictionary entry: septillion