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

quintillion

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