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The definition of antagonist

3 Definitions of: antagonist

1. noun, an opponent or adversary, as in a contest, drama, sporting event, etc
2. noun, any muscle that opposes the action of another
3. noun, a drug that counteracts the effects of another drug. Compare synergist
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5. Show me the etymology of the word: antagonist

Synonyms:	enemy, opponent, rival, oppose, competitor, contend, foe, adversary

From Collins