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- billionth
- One part in a billion equal parts
- Position 1,000,000,000 in a countable series of things
- The ordinal number of one billion in counting order

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- billionth
- One part in a billion equal parts
- Position 1,000,000,000 in a countable series of things
- The ordinal number of one billion in counting order

- millionth
- (a.) Being the last one of a million of units or objects counted in regular order from the first of a series or succession; being one of a million.
- (n.) The quotient of a unit divided by one million; one of a million equal parts.