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.
© Webster 1913.