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