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The definition of antagonism

4 Definitions of: antagonism

    1. noun, openly expressed and usually mutual opposition
    2. noun, the inhibiting or nullifying action of one substance or organism on another
    3. noun, physiol the normal opposition between certain muscles
    4. noun, biology the inhibition or interference of growth of one kind of organism by another
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    6. Show me the etymology of the word: antagonism

From Collins