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tropical depression

noun, Meteorology.
an atmospheric low-pressure system originating in the tropics, specifically, a tropical cyclone in which the maximum sustained wind speed is 38 miles per hour (62 kilometers per hour) or less.
Origin of tropical depression
1845-50; tropical + depression (in the sense “(low atmospheric pressure”) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for tropical depression

tropical depression

(Caribbean) an area of heavy rains and winds, the first stage in the development of a possible hurricane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for tropical depression

a cyclone in a tropical region that is more intense than a disturbance but less than a storm, with wind speeds of 38 mph or less's 21st Century Lexicon
Copyright © 2003-2014, LLC
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tropical depression in Science
tropical depression  
A tropical cyclone having sustained surface winds less than 39 mi (63 km) per hour. See Note at cyclone.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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