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The Collaborative International Dictionary
Septillion

Septillion \Sep*til"lion\, n. [F. septilion, formed fr. L. septem seven, in imitation of million.] 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.

Douglas Harper's Etymology Dictionary
septillion

1680s, from sept- (see septi-) + (m)illion. Compare billion.

Wiktionary
septillion

num. 1 (''US; modern British & Australian, http://en.wikipedia.org/wiki/Long%20and%20short%20scales'') A trillion trillion: 1 followed by 24 zeros, 1024. 2 (''dated British & Australian, http://en.wikipedia.org/wiki/Long%20and%20short%20scales'') A billion quintillion: 1 followed by 42 zeros, 1042.

Usage examples of "septillion".

I can have any of their septillions of bits for you within thirty seconds of your asking for it.

In a cubic inch of hydrogen gas, then, for example, there are 125,000,000,000,000,000,000,000,000 one hundred and twenty five septillions of atoms, moving with the inconceivable velocity that is implied by their making thousands of millions of changes of direction every second.

A septillion worlds, octillion, nonillion decillion-there were not numbers in the mind of man to compass the larger reality.

A septillion worlds, octillion, nonillion decillion—there were not numbers in the mind of man to compass the larger reality.