Contranym Definition
    noun
  
 A word that has two opposing meanings, such as cleave (“come together” or “split apart”).
Wiktionary 
Other Word Forms of Contranym
Noun
Singular:
 contranymPlural:
 contranymsOrigin of Contranym
-  
contra- + -onym, coined 1962 by Jack Herring as contronym.
From Wiktionary
 
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