equivalent air speed

Also found in: Dictionary.

equivalent air speed (EAS)

The calibrated air speed of an aircraft corrected for adiabatic compressible airflow for the particular altitude. It is the indicated air speed corrected for inherent errors within the instrument and errors caused by compression of the air inside the pitot tube. Equivalent air speed is equal to calibrated air speed in the standard atmosphere at sea level.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved