Active hostility or opposition between conflicting groups or individuals. The antagonism between the two rival teams was evident during the match.
A relationship between two species in which one organism benefits at the expense of the other. In nature, antagonism can be observed in the relationship between a predator and its prey.
A situation in which two drugs or chemicals interfere with each other's effects. The doctor warned that there might be antagonism between the prescribed medication and the over-the-counter drug.
In physiology, the opposing action of muscles or nerves in which one counteracts the other. Smooth movement of the arm relies on the antagonism of the biceps and triceps.