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Added 10 October 2026

billionth

/ˈbɪl.i.ənθ/ noun

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about billionth at Wordnik → Where our words come from →

Position 1,000,000,000 in a countable series of things.
One part in a billion equal parts.

adjective

The ordinal number of one billion in counting order.

Origin

From billion + -th (ordinal suffix).

From Wiktionary, via Kaikki.org (CC BY-SA)

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