What concept reflects a lack of agreement in a group?

Dissensus is the correct concept that reflects a lack of agreement within a group. It highlights the differences in opinion, belief, or perspective among group members. In a public relations context, understanding dissensus is crucial because it can inform strategies for communication, negotiation, and conflict resolution within teams or when engaging with stakeholders.

This concept is particularly significant when trying to foster collaboration or when addressing issues that involve diverse viewpoints. By acknowledging and addressing dissensus, public relations professionals can create more inclusive communication plans and ensure that all voices are heard.

Other concepts listed, while related to group dynamics, do not specifically pertain to a lack of agreement. Monounic consensus suggests a unifying agreement that doesn't capture the essence of disagreement. False consensus refers to the overestimation of commonality of opinions, which does not reflect actual discord. Pluralistic ignorance involves a situation where individuals mistakenly believe their private thoughts or feelings are different from those of the group, but this doesn’t denote the direct absence of agreement. Thus, dissensus serves as the most accurate reflection of disagreement in a group context.