Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of nonillion is as below...

Nonillion :: Nonillion (n.) According to the French and American notation, a thousand octillions, or a unit with thirty ciphers annexed; according to the English notation, a million octillions, or a unit with fifty-four ciphers annexed. See the Note under Numeration..

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