billionthadj.n.
/ˈbɪljənθ/, U.S. /ˈbɪljənθ/ A. adj.
The ordinal adjective corresponding to ‘billion’.
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the world > relative properties > number > specific numbers > hundred and over > [adjective] > billionth
billionth1778
1778 Maseres Converg. Series in Philos. Trans. (Royal Soc.) 68 900 The billionth root of 10 will be = 1.000,000,000,002,302,585,093.
B. n.
The billionth part.
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the world > relative properties > number > specific numbers > hundred and over > [noun] > million million > billionth
billionth1865
1865 J. W. Draper Intell. Devel. Europe xxv. 607 The vibrations which thus occasion light are, at a mean, 525 in the billionth of a second.
This entry has not yet been fully updated (first published 1887; most recently modified version published online December 2021).
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adj.n.1778- quartergallery
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