say it: an-TAG-uh-niz-uhm
antagonism is a noun meaning "a state of deep-seated ill-will". It carries 4 recorded senses.
the relation between opposing principles or forces or factors
“the inherent antagonism of capitalism and socialism”
(biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure
biochemistry
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for antagonism come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.