mean chord
mean chord
[′mēn ′kȯrd] (aerospace engineering)
That chord of an airfoil that is equal to the sum of all the airfoil's chord lengths divided by the number of chord lengths; equivalently, that chord whose length is equal to the area of the airfoil section divided by the span.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
mean chord

The mean geometric chord location is the same for two extreme positions of the root chord.
ii. Sometimes wrongly referred to as a mean aerodynamic chord.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved