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Definition of Billionth
1. Noun. Position 1,000,000,000 in a countable series of things.
Geographical relationships: America, The States, U.s., U.s.a., United States, United States Of America, Us, Usa
Generic synonyms: Rank
Generic synonyms: Rank
2. Adjective. The ordinal number of one billion in counting order.
Similar to: Ordinal
3. Noun. One part in a billion equal parts.
Definition of Billionth
1. [n -S]