1.Definition: (biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure

Category: General

2.Definition: a state of deep-seated ill-will

Related Noun(s):enmity, hostility

Category: General

3.Definition: an actively expressed feeling of dislike and hostility

Category: Feelings

4.Definition: the relation between opposing principles or forces or factors

"The inherent antagonism of capitalism and socialism"

Category: General