octillionthn.
/ɒkˈtɪljənθ/, U.S. /ɑkˈtɪlj(ə)nθ/ Each of an octillion equal parts into which something is or may be divided.
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the world > relative properties > number > specific numbers > hundred and over > [noun] > division of power of a million
centillionth1815
decillionth1830
octillionth1842
sextillionth1842
trillionth1848
quadrillionth1883
1842 J. Kitchen tr. G. H. G. Jahr New Homœopathic Pharmacopœia i. iii. 50 The following is the table of designations used in Germany, for the attenuations made in the proportion of 1 to 100... Twenty-4th [attenuation]..= octillionths.
1848 Fraser's Mag. 37 647 The millionth of a grain is a very common dose; and a trillionth, octillionth, even a decillionth, very usual ones.
1975 B. Felton & M. Fowler Most Unusual 196 Postwar inflation diminished the value of the Hungarian pengo in 1946 to 1/828 octillionth of what it had been before the inflation spiral began.
This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).
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n.1842