ANTAGONISM

Explanation :- 
Opposition of a conflicting force, tendency, or principle Dictatorship, actively expressed opposition or hostility Extreme unfriendliness or active opposition:

There’s a history of antagonism between the two teams.
The antagonism towards neighboring states.
The historic antagonisms between the countries of Western Europe .
Medicine is :- Anac. anh. ant-t. aur, aur-m-n. aur-s. bar-c, cann-i. cann-s, Crot-c. dendr-pol. irid-met. Kali-c. kali-p. lac-c. Lac-h. lil-t. op. paro-i, sal-fr. Sep. Sil. verb.