Definition of 'billion'

Noun

1. the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen
      Synonyms: one million million 1000000000000
2. a very large indefinite number (usually hyperbole); "there were millions of flies"
      Synonyms: million trillion zillion jillion
3. the number that is represented as a one followed by 9 zeros
      Synonyms: one thousand million 1000000000

Adjective

1. denoting a quantity consisting of one thousand million items or units in the United States
2. denoting a quantity consisting of one million million items or units in Great Britain

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