a wind coming from directly behind a moving object, especially an aircraft or other vehicle (opposed to headwind ).

1895–1900; tail1 + wind1

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World English Dictionary
tailwind (ˈteɪlˌwɪnd)
Compare headwind a wind blowing in the same direction as the course of an aircraft or ship

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The tailwind behind medallion inflation is a cap on taxi cab licenses.
Ever easier mortgage terms and falling interest rates provided a brisk tailwind
  for home prices.
The wind currents vary so that there can be a considerable headwind one minute
  and a tailwind the next.
Tailwind, the airport's restaurant and lounge is open for breakfast, lunch and
  dinner serving casual food.
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