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Adjective billionth has 1 sense
  1. billionth - the ordinal number of one billion in counting order
    Antonym:     cardinal (indirect, via ordinal)
,Noun billionth has 2 senses
  1. billionth - position 1,000,000,000 in a countable series of things
    --1 is a kind of     rank
  2. one-billionth, billionth - one part in a billion
    --2 is a kind of common fraction, simple fraction
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