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billion vs. trillion

billion

noun

plural billions, (as after a numeral) billion.
  1. a cardinal number represented in the U.S. by 1 followed by 9 zeros, and in Great Britain by 1 followed by 12 zeros.
  2. a very large number:

    I've told you so billions of times.

adjective

  1. equal in number to a billion.

trillion

noun

plural trillions, (as after a numeral) trillion.
  1. a cardinal number represented in the U.S. by 1 followed by 12 zeros, and in Great Britain by 1 followed by 18 zeros.

adjective

  1. amounting to one trillion in number.