Which term refers to a state of mutual harmony between people or groups?

The term that describes a state of mutual harmony between people or groups is 'peace.' Peace signifies not just the absence of conflict, but also the presence of constructive relationships and an environment where individuals can coexist without hostility.

In contexts such as community relations or international affairs, peace reflects a collaborative spirit and collective well-being. This aligns with the concept of harmony, which encompasses understanding, cooperation, and constructive dialogue among individuals or groups.

While 'agreement' could imply that parties have come to terms on a specific issue, it does not necessarily denote an overarching state of harmony. 'Conflict' and 'disagreement' clearly contradict the idea of harmony, establishing opposition and tension rather than cooperation and mutual respect. Thus, 'peace' is the most fitting term that encapsulates a state of mutual harmony.