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billionth (adj., n.)

1778, from billion + -th (2).

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Definitions of billionth from WordNet
1
billionth (n.)
position 1,000,000,000 in a countable series of things;
billionth (n.)
one part in a billion equal parts;
Synonyms: one-billionth
2
billionth (adj.)
the ordinal number of one billion in counting order;
From wordnet.princeton.edu