deepening(redirected from deepen)
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A decrease in the central pressure of a pressure system on a constant-height chart, or an analogous decrease in height on a constant-pressure chart.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A further decrease in the central pressure of a pressure system. A depression is deepening if there is a further fall of pressure at its center. The term is normally used with low-pressure systems, although it could be used with a high-pressure system as well.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved