Synonyms for billionth
bil·lionth

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1. billionthnoun

   position 1,000,000,000 in a countable series of things

   Synonyms:
   one-billionth

   Antonyms:
   cardinal

2. one-billionth, billionthadjective

   one part in a billion equal parts

   Synonyms:
   one-billionth

   Antonyms:
   cardinal

3. billionthadjective

   the ordinal number of one billion in counting order

   Antonyms:
   cardinal

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1. Jim Eckles:

   Every neutron splits an atom, two neutrons come out they each split atoms, they split four more and it's a chain reaction, and it cascades and it all happens in a billionth of a second. Boom, you've got a nuclear explosion.