True airspeed (TAS)

The airspeed of an aircraft relative to undisturbed air. True airspeed is equal to equivalent airspeed multiplied by (ρ0/ρ)1/2. (FAR definition).
Actual airspeed, determined by applying a correction for pressure altitude and temperature to the CAS. (PHAK definition)

Source: 14 CFR Federal Aviation Regulations §1, Pilot Handbook of Aeronatical Knowledge

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