Airspeed is a term used in aviation to describe the speed of an aircraft relative to the surrounding air. However, there are several other terms that can be used synonymously with this term. These include groundspeed, which is the speed of the aircraft relative to the ground, and true airspeed, which is the speed of the aircraft relative to the air mass in which it is flying. Another term that can be used synonymously with airspeed is indicated airspeed, which is the speed indicated on the aircraft's airspeed indicator. These terms are important for pilots to understand and monitor in order to ensure a safe and efficient flight.