quadrillionthadj.n.
/kwɒˈdrɪljənθ/, /kwəˈdrɪljənθ/, U.S. /kwɑˈdrɪljənθ/ A. adj.
That is one of the quadrillion equal parts into which something may be divided; forming the last of a series of a quadrillion.
ΚΠ
1851 W. Hooker Homœopathy 26 Hahnemann speaks of a preparation of gold so attenuated, that each grain contains only the quadrillionth part of a grain of the gold.
1979 Jrnl. Polit. Econ. 87 887 I would be glad to bid ten to the quadrillionth power of dollars for my candidate.
2003 Sci. Amer. May 14/2 A pickup group of amateurs incorporated it into a widely distributed program that let them tease out the quadrillionth digit of pi.
B. n.
Any of the quadrillion equal parts into which something may be divided.
ΘΚΠ
the world > relative properties > number > specific numbers > hundred and over > [noun] > division of power of a million
centillionth1815
decillionth1830
octillionth1842
sextillionth1842
trillionth1848
quadrillionth1883
1883 Notes & Queries 24 Mar. 234/1 A quadrillionth.
1976 New Yorker 3 May 30/3 Further advances..should make it possible to record even faster chemical reactions—reactions that take place in femtoseconds, or quadrillionths of a second.
1996 Economist 16 Mar. 111/2 A laser that produces a short enough pulse (around 50 quadrillionths of a second) can now be made to fit on a laboratory bench.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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adj.n.1851