Which word describes a conflict or disagreement?

The term that accurately describes a conflict or disagreement is "dissonance." Dissonance refers to a lack of agreement or harmony between ideas, beliefs, or actions, indicating that there are opposing views or conflicts present. This word is commonly used in both social and philosophical contexts to denote situations where differing opinions lead to discord.

In contrast, the other terms presented carry meanings that imply agreement or cohesion. "Harmony" refers to a consistent and peaceful relationship, where elements complement rather than oppose each other. "Agreement" denotes a consensus or accord among parties, while "unity" suggests a state of being united or forming a whole. Therefore, "dissonance" stands out as the only option that encapsulates the essence of conflict or disagreement.