Antagonism

antagonism [ an-TAG-uh'-niz-uh'm ]
[ noun ]

MEANING :
1. an active opposition
2. hostility that results in active resistance

EXAMPLE 1 :
The lawyer cross-examined the witness in such a way that the witness was overcome with antagonism.

EXAMPLE 2 :
The old order, based on antagonism, is being replaced by a brand new approach, based on friendship, co-operation and even fraternity.