What is the term for differing in sentiment or opinion, especially from the majority?

The term that best describes differing in sentiment or opinion, especially from the majority, is "dissent." Dissent specifically refers to the expression of views that go against mainstream or commonly accepted beliefs. It is often used in contexts such as politics, law, and social movements, where individuals or groups voice disagreement with prevailing opinions or decisions. This concept is fundamental in democratic societies, where the right to dissent is protected as part of free speech and participation in civic discourse.

In contrast, the other options do not align with the definition provided in the question. "Disturbance" refers to a disruption or interruption of a peaceful situation or condition, rather than a difference in opinion. "Duel" indicates a prearranged combat between two individuals, often in a formal setting, unrelated to expressing differing sentiments. "Discrimination" involves treating people unfairly based on a characteristic such as race, gender, or age, rather than addressing differing opinions or sentiments. Hence, the correct choice emphasizes the essence of opposing views, which is encompassed in the term "dissent."