Definitions

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

  • n. The cardinal number equal to 1015.
  • n. Chiefly British Septillion.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A thousand trillion: 1 followed by fifteen zeros, 1015.
  • n. A million trillion: 1 followed by twenty-four zeros, 1024.
  • n. Any very large number, exceeding normal description.

from the GNU version of the Collaborative International Dictionary of English

  • n. According to the French notation, which is followed also upon the Continent and in the United States, a unit with fifteen ciphers annexed; according to the English notation, the number produced by involving a million to the fourth power, or the number represented by a unit with twenty-four ciphers annexed. See the Note under numeration.

from The Century Dictionary and Cyclopedia

  • The cardinal numeral obtained from a quadrillion: used like hundred.
  • n. The fourth power of a million according to the system of numeration called English; but the fifth power of a thousand according to the French system, commonly used in the United States.

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

  • n. the number that is represented as a one followed by 15 zeros
  • n. the number that is represented as a one followed by 24 zeros

Etymologies

quadr(i)- + (m)illion.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French (Wiktionary)

Examples

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  • Also known as the Squarillion Cut, this gem cut is a modified square Princess Cut developed in the late 1970s and patented and trademarked in 1980. Before its development, square-shaped diamonds were step-cut, which limited their brilliance.

    September 24, 2007