Plural of eighteenth; multiple fractions or positions that each represent one part out of eighteen equal divisions.
From 'eighteenth' (formed from 'eighteen' plus ordinal suffix '-th') with plural '-s' added. Used both for fractional parts and ordinal positions.
If you divide a pizza into eighteen slices, each slice is one-eighteenth of the pizza—and mathematically, 18 eighteenths always equals 1 whole, no matter what you're dividing!
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