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Synonyms for billionth

Noun

1. billionth, rank
usage: position 1,000,000,000 in a countable series of things
2. one-billionth, billionth, common fraction, simple fraction
usage: one part in a billion equal parts

Adjective

1. billionth, ordinal (vs. cardinal)
usage: the ordinal number of one billion in counting order
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