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



BrE BrE//kwɪnˈtɪljən//
; NAmE NAmE//kwɪnˈtɪljən//
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the number 1018, or 1 followed by 18 zeros Word Origin late 17th cent.: from French, from million, by substitution of the prefix quinti- ‘five’ (from Latin quintus ‘fifth’) for the initial letters.
See the Oxford Advanced American Dictionary entry: quintillion