What is the main distinction between "concurrence" and "unanimity" in parliamentary procedure?

The correct distinction between "concurrence" and "unanimity" in parliamentary procedure is that concurrence involves general agreement. This signifies that while most members support a proposal, it does not require everyone to be in full agreement. It reflects a sense of consensus where the majority or a significant number of members are aligned without necessarily needing the approval of each individual.

In contrast, unanimity requires that every member present is in complete agreement on the matter at hand, leaving no room for dissent or differing opinions. This level of consensus indicates a strong, unified stance on an issue, which is more stringent than the general agreement associated with concurrence. Therefore, the understanding that concurrence allows for some variation in opinion while still reflecting overall support is key to recognizing its role in parliamentary procedure.