WordReference Random House Learner's Dictionary of American English © 2017
an•tag•o•nism /ænˈtægəˌnɪzəm/USA pronunciation   n. 
  1. active hostility or opposition: [uncountable]The proposal provoked antagonism among committee members.[countable]Antagonisms rose sharply.
See -agon-.
WordReference Random House Unabridged Dictionary of American English © 2017
an•tag•o•nism  (an tagə niz′əm),USA pronunciation n. 
  1. an active hostility or opposition, as between unfriendly or conflicting groups:the antagonism between the liberal and the conservative parties.
  2. an opposing force, principle, or tendency:Her plan to become an actress met with the antagonism of her family.
  3. Physiologyan opposing action, as by one muscle in relation to another.
  4. Biochemistry, Drugsthe opposing action of substances, as drugs, that when taken together decrease the effectiveness of at least one of them (contrasted with synergism).
  5. Ecology
    • a relationship between two species of organisms in which the individuals of each species adversely affect the other, as in competition.
    • the inhibition of the growth of one type of organism by a different type that is competing for the same ecological niche.
  • Greek antagó̄nisma. See antagonize, -ism
  • French antagonisme)
  • ( 1835–40
    • 1.See corresponding entry in Unabridged conflict, friction, strife.
    • 2.See corresponding entry in Unabridged animosity.

Collins Concise English Dictionary © HarperCollins Publishers::

antagonism /ænˈtæɡəˌnɪzəm/ n
  1. openly expressed and usually mutual opposition
  2. the inhibiting or nullifying action of one substance or organism on another

'antagonism' also found in these entries:

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