Wiktionary
eighteenths
n. (plural of eighteenth English)
Usage examples of "eighteenths".
The whole damn human race dated itself in eighteenths of Jupiter's passes about the sun, to the astonishingly recent number of about 10k such fractions, if you took the oldest cities.
The whole damn human race dated itself in eighteenths of Jupiter’s passes about the sun, to the astonishingly recent number of about 10k such fractions, if you took the oldest cities.