tail·wind or tail wind (t?l?w?nd?)n.1. A wind blowing in the same direction as that of the course of an aircraft, ship, or other vehicle.2. tailwinds Informal Favorable economic conditions: a company experiencing tailwinds from increased consumer demand.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.tailwind (?te?l?w?nd) na wind blowing in the same direction as the course of an aircraft or ship. Compare headwindCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014tail?wind (?te?l?w?nd) n. a wind from directly behind a moving object (opposed to headwind). [1895?1900] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.