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A significant variation in the speed or velocity of the wind with respect to location or altitude, as in the speed change of a downdraft, or in the directional change of lateral winds along the edge of a thunderstorm.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Aeronautics) stress on an aircraft in an area in which winds of different speeds and directions are close together
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. the rate at which wind velocity changes from point to point in a given direction.
2. a condition, dangerous to aircraft, in which the speed or direction of the wind changes abruptly.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A change of wind direction and magnitude.
Dictionary of Military and Associated Terms. US Department of Defense 2005.