What is defined as the point at which a propeller's RPM exceeds the selected target?

The correct answer, which is "Overspeed," refers to the condition experienced when a propeller's revolutions per minute (RPM) surpass the designated target RPM. This situation can occur due to various factors, such as engine power settings, changes in load, or mechanical issues. When the RPM exceeds the target, it poses a risk of mechanical failure or degradation of performance, as the components are designed to operate within specific RPM thresholds.

In aviation, monitoring RPM is critical for safe operation, and "overspeed" is a term that alerts pilots and engineers to a potentially hazardous condition that requires attention. Taking proactive measures, such as reducing engine power or adjusting pitch, can help prevent damage.

The other options refer to different concepts in aviation mechanics, which do not directly address the condition of surpassing the target RPM. Thus, "overspeed" precisely captures the essence of the situation described in the question.