What is the term for someone who expresses a minority opinion in a debate or vote?

The term for someone who expresses a minority opinion in a debate or vote is "Dissenter." A dissenter is an individual who disagrees with the prevailing view or consensus within a group, whether that is during a formal voting process or a more informal discussion. This person advocates for an alternative perspective, often emphasizing the importance of diversity in opinions and fostering healthy discourse.

In contexts like decision-making or legislative processes, dissenters play a crucial role by introducing different viewpoints, which can lead to more robust discussions and better-informed decisions. Their presence can stimulate critical thinking and encourage others to consider multiple angles on an issue. Overall, the term highlights the significance of individual thought in collaborative environments.