All 3 Uses

antagonism
in
Strength in What Remains
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In 1988, during Deo's senior year in high school, Bishop Bududira had written a bold public letter, urging the government to abandon its "deliberate refusal to talk about ethnic antagonism.†
Chpt 1.7

antagonism = hostility or opposition
Ethnic antagonism, the bishop warned, had become "extremely acute."†
Chpt 1.7 *
By the time the Europeans arrived, Rwandans were not only "conscious of a great divide between Tutsi and Hutu," but the "antagonism between these two social categories had already broken into the open."†
Chpt Hist

Definitions:

(1) (antagonism)
hostility, opposition, or tension between opposing forces or ideas
(2) (meaning too rare to warrant focus)
More rarely, antagonism can refer to the relation between opposing principles, forces, or factors. In biochemistry, it can refer specifically to one chemical's interference with another.