• The cardinal number equal to 10<sup>18</sup>.
  • The cardinal number equal to 10<sup>30</sup>.
  • In the English notation, the fifth power of a million, a unit followed by thirty ciphers; in the French notation, used generally in the United States, the sixth power of one thousand, a unit followed by eighteen ciphers.
  • Noting a quintillion; the cardinal numeral corresponding to a quintillion: strictly a collective noun. See <internalXref urlencoded="hundred">hundred</internalXref>, a.
  • A <xref>billion</xref> <xref>billion</xref>: 1 followed by eighteen zeros, 1018.
  • A <xref>million</xref> <xref>quadrillion</xref>: 1 followed by 30 zeros, 1030.
  • Any very large number, exceeding normal description.
  • the number that is represented as a one followed by 18 zeros
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