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

Derived forms: antagonisms

Type of: dislike, enmity, hinderance, hindrance, hostility, ill will, interference, oppositeness, opposition, state

Encyclopedia: Antagonism