1. A state of deep-seated ill-will (synset 114003773)
  2. The relation between opposing principles or forces or factors (synset 113882745)
    "the inherent antagonism of capitalism and socialism"
  3. An actively expressed feeling of dislike and hostility (synset 107563832)
  4. (biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure (synset 101076176)

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