1) French word used in English 
• (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.
Sep·til'lion noun [ French septilion , formed from Latin 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 met...
A number equal to 1024. See also: Octillion, Sextillion.
noun the number that is represented as a one followed by 24 zeros