What defines a rejected takeoff?

A rejected takeoff is defined as a situation where the pilot decides to abort the takeoff after beginning the takeoff roll. This often occurs due to various reasons, such as encountering an unexpected problem with the aircraft, noticing an obstacle on the runway, or receiving data indicating that it is unsafe to continue. By making the decision to halt the takeoff process, the flight crew prioritizes safety and ensures that no further risks are taken. This is a critical maneuver that requires the pilot to effectively apply brakes and bring the aircraft to a stop before reach a certain speed, typically known as V1, where the aircraft would be committed to takeoff despite any issues. Recognizing this definition is essential for understanding flight safety protocols and procedures.