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Definitions of billion
  1. noun
    the number that is represented as a one followed by 9 zeros
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  2. noun
    a very large indefinite number (usually hyperbole)
  3. noun
    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
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  4. adjective
    denoting a quantity consisting of one million million items or units in Great Britain

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  5. adjective
    denoting a quantity consisting of one thousand million items or units in the United States

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Definition that contains billion
  • a a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
  • gates United States computer entrepreneur whose software company made him the youngest multi-billionaire in the history of the United States (born in 1955)
  • galaxy (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
  • ng one billionth (1/1,000,000,000) gram
  • billionaire a very rich person whose material wealth is valued at more than a billion dollars
  • angstrom a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
  • nanosecond one billionth (10^-9) of a second; one thousandth of a microsecond
  • billionth one part in a billion equal parts
  • billionth the ordinal number of one billion in counting order
  • nanometre a metric unit of length equal to one billionth of a meter
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