• IPA: /ˈbɪljən/

billion (plural billions)

  1. (US, modern British & Australian, short scale) a thousand million (logic: 1,000 × 1,000^2 ↗): 1 followed by nine zeros, 109; a milliard
  2. (dated, rare, British & Australian, long scale) A million million (logic: 1,000,000^2 ↗): a 1 followed by twelve zeros; 1012
  3. (colloquial, hyperbole) An unspecified very large number.
    There were billions of people at the concert.
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