isogram

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isogram

[′ī·sə‚gram]
(mathematics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

isopleth

On a chart or a graph, a line of constant value of a given quantity with respect to either space or time. Also called an isogram.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved