"antagonism" in the noun sense
1. hostility, enmity, antagonism
a state of deep-seated ill-will
2. antagonism
the relation between opposing principles or forces or factors
"the inherent antagonism of capitalism and socialism"
3. antagonism
an actively expressed feeling of dislike and hostility
4. antagonism
biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure
Source: WordNet® (An amazing lexical database of English)
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