antagonism

The definition of antagonism is an ongoing aggression or animosity between two individuals or groups.

(noun)

An example of antagonism is when a group of students repeatedly bully another group.

Antagonism is defined as a state of opposition.

(noun)

An example of antagonism is when constituents disagree on principle with a stance their congressional representative has made.

In physiology, the definition of antagonism is two muscles working in opposition.

(noun)

An example of antagonism is how the biceps and triceps work when extending and flexing the elbow.

See antagonism in Webster's New World College Dictionary

noun

the state of being opposed or hostile to another or to each other; opposition or hostility
an opposing force, principle, etc.; specif., a mutually opposing action that can take place between organisms, muscles, drugs, etc.

Origin: Gr antagōnisma < antagōnizesthai: see antagonize

See antagonism in American Heritage Dictionary 4

noun

Hostility that results in active resistance, opposition, or contentiousness. See Synonyms at enmity.
The condition of being an opposing principle, force, or factor: the inherent antagonism of capitalism and socialism.
Biochemistry Interference in the physiological action of a chemical substance by another having a similar structure.

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