What does V1 represent in aviation terminology?

In aviation terminology, V1 is critically important as it represents the speed during the takeoff phase at which an aircraft must continue its takeoff even if one engine fails. This decision speed is a key parameter in ensuring the safety of the operation, as it marks the point beyond which the pilot must commit to the takeoff maneuver.

If an engine failure occurs before reaching V1, pilots have the option to abort the takeoff safely. However, once V1 has been surpassed, the aircraft is often too heavy or too close to the end of the runway to safely stop, thus necessitating continued takeoff. This speed is carefully calculated based on aircraft weight, runway length, weather conditions, and other factors, making it a critical component of flight safety protocols and decision-making processes during takeoff.