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 septillion is as below...

Septillion :: Septillion (n.) According to the French method of numeration (which is followed also in the United States), the number expressed by a unit with twenty-four ciphers annexed. According to the English method, the number expressed by a unit with forty-two ciphers annexed. See Numeration..

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