- 1. adj. the ordinal number of one billion in counting order Source: wordnet
- 2. n. position 1,000,000,000 in a countable series of things Source: wordnet
- 3. n. one part in a billion equal parts Source: wordnet
- 4. n:100 n. position 1,000,000,000 in a countable series of things s. the ordinal number of one billion in counting order Source: ecdict
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