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tailwind

[teyl-wind]
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noun
  1. a wind coming from directly behind a moving object, especially an aircraft or other vehicle (opposed to headwind).
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Origin of tailwind

First recorded in 1895–1900; tail1 + wind1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for tailwind

tailwind

noun
  1. a wind blowing in the same direction as the course of an aircraft or shipCompare headwind
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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