[air-uh-naw-tiks, -not-iks]
noun (used with a singular verb)
the science or art of flight.

1820–25; < Neo-Latin aeronautica or French aéronautique; see aero-, nautical, -ics Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aeronautics (ˌɛərəˈnɔːtɪks)
(functioning as singular) the study or practice of all aspects of flight through the air

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1824, from aeronautic (1784), from Fr. aéronautique, from aéro- (from Gk. aer "air") + nautique "of ships," from L. nauticus, from Gk. nautikos. Originally of balloons.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
aeronautics   (âr'ə-nô'tĭks)  Pronunciation Key 
  1. The design, construction and operation of aircraft.

  2. The scientific study of flight through the atmosphere.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They cannot fix a petrol engine, let alone know the basis of aeronautics.
The list of items created by aeronautics that is now used every day is almost endless.
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