D defs.my
Entry 1 sense Webster, 1913

Septillion

· Sep·til·lion · IPA /sɛpˈtɪljən/
01 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…
  1. 1.
    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. See: Numeration