The term "expert opinion" refers to a statement or conclusion based on the specialized knowledge and experience of an individual who is considered an expert in a particular field. In other words, it's an informed judgment or assessment made by someone with extensive knowledge, skills, and training relevant to the matter at hand. Expert opinions are often sought after when making important decisions that require specialized knowledge or technical understanding. They can be based on empirical evidence, research data, observation, analysis, or a combination of these factors. In legal contexts, expert opinions may also serve as testimony in court cases to help juries understand complex issues. Overall, an "expert opinion" is considered authoritative and trustworthy because it's based on the knowledge and experience of someone who has spent significant time studying and working within their field.