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antagonist

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The definition of an antagonist is a person or thing that competes with or goes against another.

(noun)

Darth Vader is an example of an antagonist to Luke Skywalker.

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See antagonist in Webster's New World College Dictionary

noun

a person who opposes or competes with another; adversary; opponent
a muscle, drug, etc. that acts in opposition to or counteracts another

See antagonist in American Heritage Dictionary 4

noun

One who opposes and contends against another; an adversary.
The principal character in opposition to the protagonist or hero of a narrative or drama.
Physiology A muscle that counteracts the action of another muscle, the agonist.
Biochemistry A chemical substance that interferes with the physiological action of another, especially by combining with and blocking its nerve receptor.

Related Forms:

an·tagˌo·nisˈtic adjective

an·tagˌo·nisˈti·cal·ly adverb

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