Definitions

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

  • n. The cardinal number equal to 1012.
  • n. Chiefly British The cardinal number equal to 1018.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A million million: 1 followed by twelve zeros, 1012.
  • n. A million million million: 1 followed by eighteen zeros, 1018.

from the GNU version of the Collaborative International Dictionary of English

  • n. According to the French notation, which is used upon the Continent generally and in the United States, the number expressed by a unit with twelve ciphers annexed; a million millions; according to the English notation, the number produced by involving a million to the third power, or the number represented by a unit with eighteen ciphers annexed. See the Note under numeration.

from The Century Dictionary and Cyclopedia

  • n. In the original and most systematic sense, sometimes called English numeration, though of Italian origin, the third power of a million
  • n. a million of millions of millions; in the French numeration, usual in the United States, a thousand billions, or a million millions.

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

  • adj. one quintillion in Great Britain
  • n. the number that is represented as a one followed by 18 zeros
  • n. the number that is represented as a one followed by 12 zeros
  • n. a very large indefinite number (usually hyperbole)
  • adj. one million million in the United States

Etymologies

French : tri-, third power (from Latin tri-, tri-) + (m)illion, million (from Old French milion; see million).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French trillion. (Wiktionary)

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