Define the term 'stall' in aviation.

A stall in aviation is defined as the condition that occurs when an aircraft exceeds its critical angle of attack. The critical angle of attack is the angle at which the airflow over the wings begins to separate, resulting in a significant loss of lift. This can happen at any airspeed and under various flight conditions, but it primarily relates to the angle at which the wings meet the oncoming air. When this angle is exceeded, the wings can no longer produce sufficient lift to keep the aircraft flying, leading to a stall situation.

Understanding stalling is critical for pilots, as it emphasizes the relationship between angle of attack and lift, rather than speed alone or specific flight phases like landing. This concept reinforces safe flying practices, including recognizing the aircraft's limits and controlling the angle of attack to avoid unintentional stalls.