Plural of eightieth; multiple fractions or ordinal positions each representing 1/80 of a whole or the eightieth position.
From 'eightieth' with standard plural '-s' added. Used for both fractional parts (mathematical) and ordinal positions (sequential).
While we use 'eighths' and 'tenths' often in everyday math, eightieths are rarer—you'd need something incredibly precise to divide into eighty parts!
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