Semantical relations between words are manifested in respect of homonymy, antonymy, paronymy, etc.
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Role of antonymy relations in semantic judgments.
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Towards a cognitive model of antonymy.
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More examples
The semantic relation that holds between two words that can (in a given context) express opposite meanings
In lexical semantics, opposites are words that lie in an inherently incompatible binary relationship as in the opposite pairs male : female, long : short, up : down, and precede : follow. ...
The semantic relation between antonyms; the quality of being antonymous