What does eighty-oneth mean?
Eighty-oneth means (nonstandard) eighty-first.
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/ˌeɪti ˈwʌnθ/ · adjective
(nonstandard) eighty-first.
If the diameter of the moon were the same as that of the earth, a body weighing one pound on the earth would weigh only one eighty-oneth part of a pound on the moon.
Use eighty-oneth when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Eighty-oneth means (nonstandard) eighty-first.
Common synonyms include eighty-first.
The opposite depends on the specific sense.
If the diameter of the moon were the same as that of the earth, a body weighing one pound on the earth would weigh only one eighty-oneth part of a pound on the moon.
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