D defs.my
Entry 1 sense Webster, 1913

Octillion

/äk-tĭl'-yən/ · Oc·til·lion · IPA /ɒkˈtɪl.iː.ən/
01 n. According to the French method of numeration (which method is followed also in the United States) the number expressed by a unit with twent…
  1. 1.
    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. See: Numeration