Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: quadr- + -illion (as in million)

quadrillion

 number
     
Related topics: Numbers
qua‧dril‧lion
1HMN the number one followed by 15 zeros
2 British English old useHMN the number one followed by 24 zeros
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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