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“autantonym”
autantonym
A word that means its opposite.
An example is the word fast, which when referring to a fast runner means a runner who runs rapidly or swiftly; but when it refers to a fast color, it means a color that doesn't run at all.
Based on information from Word and Phrase Origins
This entry is located in the following units:
auto-, aut-
(page 1)
-onym, -onymy, -onymic, -onymically, -onymous, -onymously, -nym +
(page 3)