What is a rejected takeoff?

A rejected takeoff refers specifically to the situation where a pilot decides to abort the takeoff after beginning the takeoff roll. This aborted takeoff can occur for various reasons, including engine failure, abnormal aircraft performance, or detected issues that could compromise safety. The pilot must apply the brakes and bring the aircraft to a stop prior to reaching a predetermined point on the runway, known as the "V1 speed," which is critical in takeoff operations.

The other options describe different aviation scenarios: a flight delay due to weather involves waiting for conditions to improve, emergency landing procedures refer to protocols followed when an aircraft must unexpectedly land, and refueling before departure pertains to preparing the aircraft for flight. These situations do not align with the specific definition and operational implications of a rejected takeoff.