What does a unanimous opinion mean in a legal context?

A unanimous opinion in a legal context means that all judges involved in a case have reached the same conclusion and agree on the legal reasoning behind their decision. This type of opinion reflects a complete consensus among the judges, indicating that they collectively endorse the outcome and reasoning of the case. When a court issues a unanimous opinion, it enhances the opinion's authority and can often lead to stronger implications in future cases, as it demonstrates a unified stance on the legal issues presented.

In contrast, the other choices illustrate scenarios that do not align with the definition of a unanimous opinion. If only one judge agrees, the opinion does not represent a collective agreement. A majority opinion implies that while most judges concur, not all do, which again does not conform to the notion of unanimity. Lastly, if no judges agree, it indicates a total disagreement among the judges, which is the opposite of a unanimous decision. Therefore, the correct interpretation of a unanimous opinion clearly reflects the agreement of all judges involved in the case.