[ey-vee-ey-shuhn, av-ee-]
the design, development, production, operation, and use of aircraft, especially heavier-than-air aircraft.
military aircraft.

1865–70; < French; see avi-, -ation

aviatic [ey-vee-at-ik, av-ee-] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aviation (ˌeɪvɪˈeɪʃən)
1.  a.  the art or science of flying aircraft
 b.  the design, production, and maintenance of aircraft
2.  (US) military aircraft collectively
[C19: from French, from Latin avis bird]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1866, from Fr. aviation, from L. avis "bird" (see aviary). Coined 1863 by Fr. aviation pioneer Guillaume Joseph Gabriel de La Landelle (1812-1886) in "Aviation ou Navigation aérienne."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These could be sprayed out of special aircraft-borne injectors, or produced by burning high-sulphur aviation fuel.
Icon aircraft has made aviation history before even finishing the final design of its first airplane.
Civil aviation security exists to prevent criminal activity on aircraft and in airports.
Given the slowdown in the commercial-aviation business, the idleness of some
  sections of the huge aircraft factory is no surprise.
Images for aviation
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