Septillion
Pronunciation : Sep*til"lion
Part of Speech : n.
Etymology : [F. septilion, formed fr. L. septem seven, in imitation of million.]
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913