Etymology
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antagonism (n.)

"state of being mutually opposed; opposition between two things or against something," 1797, from French antagonisme or directly from late Greek antagonisma, noun of action from antagonizesthai "to struggle against, oppose, be a rival," from anti "against" (see anti-) + agonizesthai "to contend for a prize," from agon "a contest, a struggle" (see agony). Milton used antagony as a noun.

updated on January 15, 2017

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Definitions of antagonism from WordNet

antagonism (n.)
a state of deep-seated ill-will;
Synonyms: hostility / enmity
antagonism (n.)
the relation between opposing principles or forces or factors;
the inherent antagonism of capitalism and socialism
antagonism (n.)
an actively expressed feeling of dislike and hostility;
antagonism (n.)
(biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.