Aviation Dictionary
سرعت حقیقی ، سرعت هوا یا هواپیما نسبت به شرایط موجود، سرعت تصحیح شده براساس چگالی هوا ، TAS
The airspeed shown on the airspeed indicator after it has been corrected for nonstandard temperature and pressure. 14 CFR Part 1: The airspeed of an aircraft relative to undisturbed air. True airspeed is equal to equivalent airspeed multiplied by (p0/p)1/2.