Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The cardinal number equal to 1018.
  • n. Chiefly British The cardinal number equal to 1030.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A billion billion: 1 followed by eighteen zeros, 1018.
  • n. A million quadrillion: 1 followed by 30 zeros, 1030.
  • n. Any very large number, exceeding normal description.

from The Century Dictionary and Cyclopedia

  • n. 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 hundred, a.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the number that is represented as a one followed by 18 zeros

Etymologies

Latin quīntus, fifth; see penkwe in Indo-European roots + (m)illion.
(American Heritage® Dictionary of the English Language, Fourth Edition)
quint- (“five”) + -illion; ie the fifth power of a million, 1030. (Wiktionary)

Examples

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