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 noun Octillion  n.  According to the French method of numeration (which method is followed also in the United States) the number expressed by a unit with twenty-seven ciphers annexed. According to the English method, the number expressed by a unit with forty-eight ciphers annexed. See Numeration. 
 
 
 
 
 
 Collaborative International Dictionary of English 0.48 
 
 
 
 
 
 
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